Manuale d’uso / di manutenzione del prodotto YZ450FA del fabbricante Yamaha
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PRINTED IN JAP AN 2010.05—0.8 × 1 ! (E) Y AMAHA MO T OR CO . , L TD . 2500 SHINGAI IW A T A SHIZUOKA JAP AN PRINTED ON RECYCLED P APER PROTECT YOUR INVESTMENT Use Genuine YAMAHA Parts And Accessori.
Q Read this manual carefull y before operating this vehicle. This manual should sta y with this vehicle if it is sold. 33D-9-10_cover 09.7.16 13:11 ページ 2.
YZ450FA OWNER'S SERVICE MANUAL ©2010 by Yamaha Motor Corporation, U.S.A. 1st Edition, May 2010 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Corporation, U.S.A. is expressly prohibited. Printed in Japan P/N.
INTRODUCTION Congratulations on your purchase of a Yamaha YZ series. This model is the culmination of Ya- maha's vast experience in the p roduction of pacesetting racing machines. It repre sents the highest grade of craftsmansh ip and reliability that have made Yamaha a leader.
SAFETY INFORMATION THIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED COURSE. It is illegal for this machin e to be operated on any public street, road, or highway. Off-road use on public lands may also be illegal. Please check local regulations be- fore riding.
YAMAHA MOTOR CORPORATION, U.S.A. YZ MOTORCYCLE LIMITED WARRANTY.
HOW TO USE THIS MANUAL FINDING THE REQUIRED PAGE 1. This manual consists of eight cha pters; "General Information", "Specifications", "Regular inspec- tion and adjustments", "Engine", "Cha ssis", "Fuel system", "Electrical" and "Tuning".
HOW TO READ DESCRIPTIONS To help identify parts and clarify procedure step s, there are exploded diagrams at the start of each removal and disassembly section. 1. An easy-to-see exploded diagram "1" is pr ovided for removal and disassembly job s.
ILLUSTRATED SY MBOLS (Refer to the illustration) Illustrated symbols "1" to "7" are used to iden ti- fy the specifications appearin g in the text. 1. With engine mounted 2. Filling fluid 3. Lubricant 4. Special tool 5. Tightening 6.
MEMO.
TABLE OF CONTENTS GENERAL INFORMATION 1 SPECIFICATIONS 2 REGULAR INSPECTION AND ADJUSTMENTS 3 ENGINE 4 CHASSIS 5 FUEL SYSTEM 6 ELECTRICAL 7 TUNING 8.
CONTENTS CHAPTER 1 GENERAL INFORMATION LOCATION OF IMPORTANT LABELS ..... 1-1 DESCRIPTION ........................................... 1-2 CONSUMER INFORMATION .................... 1-3 FEATURES ............................................... . 1-4 INCLUDED PARTS .
CHAPTER 3 REGULAR INSPECTION AND ADJUSTMENTS MAINTENANCE INTERVALS .................... 3-1 PRE-OPERATION INSPECTION AND MAINTENANCE ......................................... 3-6 ENGINE ...................................................... 3-7 CHASSIS .
CHAPTER 5 CHASSIS FRONT WHEEL AND REAR WHEEL ....... 5-2 FRONT BRAKE AND REAR BRAKE ........ 5-9 FRONT FORK ................................. ......... 5-23 HANDLEBAR ........................................... 5-36 STEERING ..........................
1-1 LOCATION OF IMPORTANT LABELS GENERAL INFORMATION LOCATION OF IMPORTANT LABELS Please read the following important la bels ca refully before operating this vehicle. Premium unleaded gasoline only. 3FB-2415E-02 4AA-22259-80 WARNING This unit contains high pressure nitrogen gas.
1-2 DESCRIPTION DESCRIPTION • The machine you have purchased may differ sl ight ly from those shown in the following. • Designs and specifications ar e subject to change without notice. 1. Clutch lever 2. Front brake lever 3. Throttle grip 4. Radiator cap 5.
1-3 CONSUMER INFORMATION CONSUMER INFORMATION There are two significant reasons for knowing the serial number of your machine: 1. When ordering parts, you can give the num- ber to your Yamaha dealer for posit ive iden- tification of the model you own.
1-4 FEATURES FEATURES OUTLINE OF THE FI SYSTEM The main function of a fuel supply system is to pr ovide fuel to the combustion ch amber at the opti- mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera- ture.
1-5 FEATURES FI SYSTEM The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regu lator maintains the fuel pressure that is applied t o the fuel injector at only 324 kPa (3.
1-6 INCLUDED PARTS INCLUDED PARTS DETACHABLE SIDESTAND This sidestand "1" is used to support only the machine when standing or transporting it. • Never apply additional force to the side- stand. • Remove this sidestand before starting out.
1-7 INCLUDED PARTS FUEL HOSE JOINT COVER The fuel hose joint covers "1" are u sed to pre- vent mud, dust, and other foreign materia l from entering the fuel pump when the fuel hose is disconnected. COUPLER FOR CONNECTING OPTIONAL PART This coupler "1" is used for connection to an op- tional Power Tuner and so on.
1-8 IMPORTANT INFORMATION IMPORTANT INFORMATION PREPARATION FOR REMOVAL AND DISASSEMBLY 1. Remove all dirt, mud, dust, and foreign ma- terial before removal and disassembly. • When washing the machine with high pres- sured water, cover the parts follows.
1-9 IMPORTANT INFORMATION LOCK WASHERS/PLATES AND COTTER PINS 1. All lock washers/plates "1" and cotter pins must be replaced when they are removed. Lock tab(s) should be bent along the bolt or nut flat(s) after the bolt or nut has been prop- erly tightened.
1-10 HANDLING THE ELECTRONIC PARTS HANDLING THE ELECTRONIC PARTS Electronic parts are very sensitive. Handle with care and do not give impact. • Mankind has static electricity .
1-11 CHECKING OF CONNECTION 5. Check: •C o n t i n u i t y (with the pocket tester) • If there is no continui ty, clean the terminals. • When checking the wire harness, perform steps (1) to (5). • As a quick remedy, use a contact revitalizer available at most part store s.
1-12 SPECIAL TOOLS SPECIAL TOOLS The proper special tools are necessary for complete and accurate tune-u p and assembly. Using the correct special tool will help prevent damage caused by the use of im proper tools or improvised tech- niques. The shape and part number u sed for the special tool differ by country, so two types are pro- vided.
1-13 SPECIAL TOOLS Steering nut wrench YU-33975, 90890-01403 This tool is used when tigh ten the steering ring nut to speci- fication. Cap bolt wrench YM-01500, 90890-01500 This tool is used to loosen or tighten the base valve. Cap bolt ring wrench YM-01501, 90890-01501 This tool is used to loosen or tighten the damper assembly.
1-14 SPECIAL TOOLS Pressure gauge. YU-03153, 90890-03153 This tool is used to me asure the fuel pressure. FI diagnostic tool YU-03182, 90890-03182 This tool is used to check the fault codes and diagnose any problems. Fuel pressure adapter YM-03186, 90890-03186 This tool is used to attach the pressure gauge.
1-15 SPECIAL TOOLS Clutch holding tool YM-91042, 90890-04086 This tool is used to hold the clutch when removing or in- stalling the clutch boss secur- ing nut. Valve guide remover 5.5 mm (0.22 in) YM-01122 This tool is needed to remove and install the valve guide .
1-16 SPECIAL TOOLS Dynamic spark tester YM-34487 Ignition checker 90890-06754 This instrument is necessary for checking the ignitio n sys- tem components. Digital tachometer YU-39951-B, 90890-06760 This tool is needed for ob- serving engine rpm. YAMAHA Bond No.
1-17 CONTROL FUNCTIONS CONTROL FUNCTIONS ENGINE STOP SWITCH The engine stop switch "1" is located on the left handlebar. Continue pushing the e ngine stop switch till the engine comes to a stop. CLUTCH LEVER The clutch lever "1" is located on the left h an- dlebar; it disengages or engages th e clutch.
1-18 CONTROL FUNCTIONS REAR BRAKE PEDAL The rear brake pedal "1" is located on the right side of the machine. Press down on the brake pedal to activate the rear brake. STARTER KNOB/IDLE SCREW The starter knob/idle screw "1" is used when starting a cold engine.
1-19 STARTING AND BREAK-IN STARTING AND BREAK-IN FUEL Always use the recommended fuel as stated below. Also, be sure to use new gasoline the day of a race. Use only unleaded gasoline. The use o f leaded gasoline will cause severe dama ge to the engine internal parts such a s valves, piston rings, and exhaust syste m, etc.
1-20 STARTING AND BREAK-IN 6. When the engine starts running, warm it up one or two minutes at a steady speed (of 3,000 to 5,000 r/min), and then return the starter knob/ idle screw to its original posi- tion. 7. Push the engine stop switch "1".
1-21 TORQUE-CHECK POINTS TORQUE-CHECK POINTS Concerning the tightening torque, refer to "T IGHTENING TORQUES" section in the CHAPTER 2. Frame construction Frame to rear frame Combined seat a.
1-22 CLEANING AND STORAGE CLEANING AND STORAGE CLEANING Frequent cleaning of your machin e will en- hance its appearance, maintain good o verall performance, and extend the life of many com- ponents. 1. Before washing the machine, block off the end of the exhaust pipe to prevent water from entering.
2-1 GENERAL SPECIFICATIONS SPECIFICATIONS GENERAL SPECIFICATIONS Model name: YZ450FA (USA, CDN, AUS) YZ450F (EUROPE, NZ, ZA) Model code number: 33D5 (USA,CDN) 33D6 (EUROPE) 33D8 (AUS, NZ, ZA) Dimensions: USA, CDN EUROPE AUS, NZ, ZA Overall length 2,193 mm (86.
2-2 GENERAL SPECIFICATIONS Oil capacity: Engine oil Periodic oil change 0.95 L (0.84 Imp qt, 1.00 US qt ) With oil filter replacement 1.0 L (0.88 Imp qt, 1.06 US qt) Total amount 1.2 L (1.06 Imp qt, 1.27 US qt) Coolant capacity (including all routes): 1.
2-3 GENERAL SPECIFICATIONS Chassis: USA, CDN EUROPE AUS, NZ, ZA Frame type Semi double cradle ←← Caster angle 26.9° 26.8° 26.9° Trail 118.6 mm (4.
2-4 MAINTENANCE SPECIFICATIONS MAINTENANCE SPECIFICATIONS ENGINE Item Standard Limit Cylinder head: Warp limit ---- 0.05 mm (0.002 in) Cylinder: Bore size 97.00–97.01 mm (3.8189–3.8193 in) ---- Out of round limit ---- 0.05 mm (0.002 in) Camshaft: Drive method Chain drive (Left) ---- Camshaft cap inside diameter 22.
2-5 MAINTENANCE SPECIFICATIONS Camshaft runout limit ---- 0.03 mm (0.0012 in) Timing chain: Timing chain type/No. of links 98XRH2010-122M/122 ---- Timing chain adjustme nt method Automatic ---- Valve, valve seat, valve guide: Valve clearance (cold) IN 0.
2-6 MAINTENANCE SPECIFICATIONS "D" margin thickness (IN) 1.3 mm (0.0512 in) ---- "D" margin thickness (EX) 1.0 mm (0.0394 in) ---- Stem outside diameter (IN) 5.475–5.490 mm (0.2156–0.2161 in) 5.445 mm (0.2144 in) Stem outside diameter (EX) 5.
2-7 MAINTENANCE SPECIFICATIONS Tilt limit* (IN) ---- 2.5°/1.8 mm (2.5°/0.071 in) Tilt limit* (EX) ---- 2.5°/1.6 mm (2.5°/0.063 in) Direction of winding (top view) (IN) Clockwise ---- Direction of winding (top view) (EX) Clockwise ---- Piston: Piston to cylinder clearance 0.
2-8 MAINTENANCE SPECIFICATIONS 2nd ring: Type Taper ---- Dimensions (B × T) 1.00 × 3.10 mm (0.04 × 0.12 in) ---- End gap (installed) 0.35–0 .50 mm (0.014–0.020 in) 0.85 mm (0.033 in) Side clearance 0.020–0.060 mm (0.0008–0.0024 in) 0.120 mm (0.
2-9 MAINTENANCE SPECIFICATIONS Clutch spring free length 50.0 mm (1.97 in) 49.0 mm (1.93 in) Quantity 6 ---- Clutch housing thrust clearanc e 0.10–0.
2-10 MAINTENANCE SPECIFICATIONS CHASSIS Lubrication system: Oil filter type Paper type ---- Oil pump type Trochoid type ---- Tip clearance 0.12 mm or less (0.0047 in or less) 0.20 mm (0.008 in) Side clearance 0.09–0.17 mm (0.0035–0.0067 in) 0.24 mm (0.
2-11 MAINTENANCE SPECIFICATIONS Rear suspension: USA, CDN EUROPE, AUS, NZ, ZA Shock absorber travel 13 2.0 mm (5.20 in) ← ---- Spring free length 260 mm (10.24 in) ← 254.8 mm (10.03 in) Fitting length 252 mm (9.9 2 in) 253 mm (9.96 in) ---- Preload length <Min.
2-12 MAINTENANCE SPECIFICATIONS ELECTRICAL Rear disc brake: Disc outside dia.×Thickness 245 × 4.0 mm (9.65 × 0.16 in) 245 × 3.5 mm (9.65 × 0.14 in) Deflection limit ---- 0.15 mm (0.006 in) Pad thickness 6.4 mm (0.25 in) 1.0 mm (0.04 in) Master cylinder inside dia.
2-13 TIGHTENING TORQUES TIGHTENING TORQUES ENGINE △ - marked portion shall b e checked for torque tightening after bre ak-in or before each race. Part to be tightened Thread size Q'ty Tightening torque Nm m•kg ft•lb Spark plug M10S × 1.0 1 13 1.
2-14 TIGHTENING TORQUES Coolant drain bolt M6 × 1.0 1 10 1.0 7.2 Oil pump cover M4 × 0.7 1 2 0.2 1.4 Oil pump M6 × 1.0 2 10 1.0 7.2 Oil pump drive gear shaft M6 × 1.0 1 10 1.0 7.2 Oil filter element cover M6 × 1.0 2 10 1.0 7.2 Oil pressure check bolt M6 × 1.
2-15 TIGHTENING TORQUES *1: Tighten the cylinder head bolts to 30 Nm (3.0 m• kg, 22 ft•lb) in the proper tigh tening sequence, remove and retighten the cylinder head bolts to 20 Nm (2.
2-16 TIGHTENING TORQUES △ Front wheel axle holder M8 × 1.25 4 21 2.1 15 △ Front brake disc and wheel hub M6 × 1.0 6 12 1.2 8.7 △ Rear brake disc and wheel hub M6 × 1.0 6 14 1.4 10 △ Footrest bracket and frame M10 × 1.25 4 55 5.5 40 △ Brake pedal mounting M8 × 1.
2-17 TIGHTENING TORQUES 1. First, tighten the steering rin g nut approximately 38 Nm (3.8 m•kg, 27 ft•lb) by using the steering nut wrench, then loosen the steering ring nut o ne turn. 2. Retighten the steering ring nu t 7 Nm (0.7 m•kg, 5.1 ft•lb).
2-18 TIGHTENING TORQUES ELECTRICAL Part to be tightened Thread size Q'ty Tightening torque Nm m•kg ft•lb Stator M5 × 0.8 3 8 0.8 5.8 Rotor M12 × 1.25 1 65 6.5 47 Crankshaft position sensor M6 × 1.0 2 10 1.0 7.2 Throttle position sensor M5 × 0.
2-19 TIGHTENING TORQUES GENERAL TORQUE SPECIFICATIONS This chart specifies torque for standard fasten- ers with standard I.S.O. pitch threads. Torque specifications for special components or as- semblies are included in the applicab le sec- tions of this book.
2-20 TIGHTENING TORQUES DEFINITION OF UNITS Unit Read Definition Measure mm millimeter 10 -3 meter Length cm centimeter 10 -2 meter Length kg kilogram 10 3 gram Weight N Newton 1 kg × m/sec 2 Force N.
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2-21 LUBRICATION DIAGRAMS LUBRICATION DIAGRAMS.
2-22 LUBRICATION DIAGRAMS 1. Oil strainer 2. Oil check bolt 3. Scavenging pump 4. Oil feed pump 5. Oil filter element 6. Crankshaft 7. Oil nozzle 8. Exhaust camshaft 9.
2-23 CABLE ROUTING DIAGRAM CABLE ROUTING DIAGRAM.
2-24 CABLE ROUTING DIAGRAM 1. Fuel tank breather hose 2. Coupler for connecting optiona l part 3. Cylinder head breather hose 4. Hose holder 5. Radiator hose 3 A. Insert the end of the fuel tank breather hose into the hole in the steering stem. B. Fit the accessory coupler into the connec- tor to fasten it to the bracket.
2-25 CABLE ROUTING DIAGRAM F-F A B D-D C-C E F F C C D D B A E 100mm.
2-26 CABLE ROUTING DIAGRAM 1. Clutch cable 2. Throttle cable (return) 3. Throttle cable (pull) 4. Cable holder 5. Clamp 6. Rectifier/regulator 7. Ignition coil 8. Ignition coil coupler 9. AC magneto coupler 10. Radiator hose 2 11. Ground lead terminal 12.
2-27 CABLE ROUTING DIAGRAM B B F G A-A C-C D-D E-E B-B G F C C D D E E A A.
2-28 CABLE ROUTING DIAGRAM 1. Tension pipe 2. Coolant temperature sensor coupler 3. Front engine bracket 4. Fuel pump coupler 5. Fuel pump 6. Intake air temperature sensor coup ler 7. Radiator hose 2 8. Radiator breather hose 9. Radiator hose 1 10. Radiator hose 4 11.
2-29 CABLE ROUTING DIAGRAM.
2-30 CABLE ROUTING DIAGRAM 1. Ignition coil coupler 2. Coolant temperature sensor lead 3. Atmospheric pressure sensor coupler 4. Intake air temperature sensor lead 5. Clamp 6. Intake air pressure se nsor coupler 7. Cover 8 Fuel hose 9. Fuel pump lead 10.
2-31 CABLE ROUTING DIAGRAM.
2-32 CABLE ROUTING DIAGRAM 1. Brake master cylinder 2. Brake hose holder 3. Brake hose A. Install the brake hose so that its pipe por- tion directs as shown and lightly touches the projection on the brake calip er. B. Pass the brake hose into the brake hose holders.
2-33 CABLE ROUTING DIAGRAM.
2-34 CABLE ROUTING DIAGRAM 1. Throttle cable 2. Clutch cable 3. Clamp 4. Engine stop switch lead 5. Hose guide 6. Main harness A. Route the clutch cable to the rear of the number plate band. B. Fasten the engine stop switch lead to the handlebar. C. Route the brake hose to the front of t he number plate.
3-1 MAINTENANCE INTERVALS REGULAR INSPECTION AND ADJUSTMENTS MAINTENANCE INTERVALS •The following schedule is inte nded as a general guide to mainte nance and lubrication. Bear in mind that such factors as weather, terrain, geographical lo cation, and individual usage will alter the re- quired maintenance and lubrication intervals.
3-2 MAINTENANCE INTERVALS PISTON Inspect ● Inspect crack. Clean ● Inspect carbon deposits and eliminate them. Replace ●● Replace the piston, pis- ton pin, piston pin clip, and piston ring all as a set. PISTON RING Inspect ● Check ring end gap.
3-3 MAINTENANCE INTERVALS EXHAUST PIPE, SI- LENCER, PROTEC- TOR Inspect and retighten ●● Clean ● Replace fiver ●● * * When the exhaust sound becomes louder or when a performance drop is felt. CRANK Inspect and clean ●● THROTTLE BODY Inspect ● SPARK PLUG Inspect and clean ●● Replace ● DRIVE CHAIN Use chain lube.
3-4 MAINTENANCE INTERVALS ENGINE GUARD Replace ● Breakage FRAME Clean and inspect ●● FUEL TANK, FUEL PUMP inspect ●● FUEL HOSE Inspect ● Replace ● Every four years BRAKES Adjust lever po.
3-5 MAINTENANCE INTERVALS REAR SHOCK AB- SORBER Inspect and adjust ●● Lube ● (After rain ride) ● Molybdenum disulfide grease Retighten ●● DRIVE CHAIN GUIDE AND ROLLERS Inspect ●● SWING.
3-6 PRE-OPERATION INSPECTION AND MAINTENANCE PRE-OPERATION INSPECTION AND MAINTENANCE Before riding for break-in operation, practice o r a race, make sure the machine is in g ood operating condition. Before using this machine, check the following points.
3-7 ENGINE ENGINE CHECKING THE COOLANT LEVEL Do not remove the radiator cap "1", drain bolt and hoses when the engine and radia- tor are hot.
3-8 ENGINE • Do not mix more than one type of ethylene glycol antifreeze containing corrosion in- hibitors for aluminum engine. • Do not use water containing impurities or oil. Handling notes of coolant: The coolant is harmful so it should be handled with special care.
3-9 ENGINE CHECKING THE COOLING SYSTEM 1. Inspect: • C oolant le vel 2. Attach: • Radiator cap tester "1" and adapter "2" 3. Apply the specified pressure. • Do not apply pressure more than specified pressure. • Radiator should be filled fully.
3-10 ENGINE • Before adjustment, expose the adjuster by moving the boot "3" and cap "4" away. • M ake minute adjustment on the lever sid e us- ing the adjuster "5". • After adjustment, check proper operation of clutch lever.
3-11 ENGINE 2. Apply: • Lithium soap base grease On the throttle cable end "a". 3. Install: • Throttle grip cap • Screw (throttle grip cap) • Cover (grip cap) • Cover (throttle cab.
3-12 ENGINE 6. Clean: • Air filter element Clean them with solve nt. After cleaning, remove the remainin g solvent by squeezing the element. • Do not twist the element when squeezing the element. • Leaving too much of solvent in the ele- ment may result in poor starting.
3-13 ENGINE 3. Install: • Air filter • Fuel tank • Air scoop (left/right) • Seat CHECKING THE FUEL LINE 1. Remove: • Seat • Fuel tank • Air scoop (left/right) • Air filter case •C o v e r 2. Check: • Fuel hose "1" Cracks/damage → Replace.
3-14 ENGINE CHANGING THE ENGINE OIL 1. Start the engine and let it warm up for sever- al minutes. 2. Stop the engine and place an oil pan under the drain bolt. 3. Remove: • Oil filler cap "1" • Drain bolt (with gasket) "2" • Drain bolt (with gasket) "3" Drain the engine oil.
3-15 ENGINE 7. Install: • Oil filler cap 8. Inspect: • Engine (for oil leaks) •O i l l e v e l CHECKING THE OIL PRESSURE 1. Check: • Oil pressure Checking steps: a. Slightly loosen the oil pressure check bolt "1". b. Start the engine and keep it idling until oil starts to seep from the oil pressure che ck bolt.
3-16 ENGINE ADJUSTING THE VALVE CLEARAN CE • This section is intended for those who have basic knowledge and skill concerning the ser- vicing of Yamaha motorcycles (e.
3-17 ENGINE c. Mea sure the valve clearance "e" using a feeler gauge "1". Record the measured reading if the clearance is incorrect. 5. Adjust: • Valve clearance Adjustment steps: a. Remove the camshaft (intake a nd exhaust). Refer to "CAMSHAFTS" section in the CHAPTER 4.
3-18 ENGINE Use the new pad number only as a guide when verifying the valve clearance adjustment. f. Install the new pads "4" and the valve lifters "5". • Apply the engine oil on the valve lifters. • Apply the molybdenum disulfide oil on the valve stem ends.
3-19 ENGINE INTAKE EXHAUST.
3-20 CHASSIS CHASSIS BLEEDING THE HYDRAULIC BRAKE SYSTEM Bleed the brake system if: • The system has been disassembled. • A brake hose has been loosened or re- moved. • The brake fluid is very low. • The brake operation is faulty. A dangerous loss of braking perform ance may occur if the brake system is not proper- ly bled.
3-21 CHASSIS 2. Remove: • Brake lever cover 3. Adjust: • Brake lever position Brake lever position adjustment step s: a. Loosen the locknut "1". b. Turn the adjusting bolt "2" until the lever po- sition "a" is within specified po sition.
3-22 CHASSIS CHECKING AND REPLACING THE FRONT BRAKE PADS 1. Inspect: • Brake pad thickness "a" Out of specification → Replace as a set. 2. Replace: •B r a k e p a d Brake pad replacement step s: a. Remove the pad pin plug "1".
3-23 CHASSIS i. Install t he brake caliper "8" and tighten the pad pin "9". j. Inst all the pad pin plug "10". 3. Inspect: •B r a k e f l u i d l e v e l Refer to "CHECKING THE BRAKE FLUID LEVEL" secti on. 4. Check: • Brake lever operation A softy or spongy feeling → Bleed brake sys- tem.
3-24 CHASSIS e. Connect the transparent h ose "8" to the bleed screw "9" and place the suitable co n- tainer under its end. f. Loosen the bleed screw and push the brake caliper piston in. Do not reuse the drained brake fluid. g. Tighten the bleed screw.
3-25 CHASSIS 2. Inspect: • Rear brake pad insulator "1" Damage → Replace. CHECKING THE BRAKE FLU ID LEVEL 1. Place the brake master cylinder so that its top is in a horizontal position. 2. Inspect: •B r a k e f l u i d l e v e l Fluid at lower level → Fill up.
3-26 CHASSIS 2. Remove: • Master link clip • Joint "1" • D rive chain "2" 3. Clean: • D rive chain Place it in kerosene, and brush off as much dirt as possible. Then remove the drive chain from the kerosene and dry the drive chain.
3-27 CHASSIS 3. Adjust: • D rive chain slack Drive chain slack adjustment ste ps: a. Loosen the axle nut "1" and locknuts "2". b. Adjust the drive chain slack by turning the adjusters "3". c. Turn each adjuster exactly the same amount to maintain correct axle alignment.
3-28 CHASSIS CLEANING THE FRONT FORK OIL SEAL AND DUST SEAL 1. Remove: •P r o t e c t o r • Dust seal "1" Use a thin screw driver, and be careful not to damage the inner fork tube and dust seal. 2. Clean: • Dust seal "a" •O i l s e a l " b " • Clean the dust seal and oil seal after every run.
3-29 CHASSIS ADJUSTING THE FRONT FORK COMPRESSION DAMPING FORCE 1. Adjust: • Compression damping force By turning the adjuster "1". • STANDARD POSITION: This is the position which is back by the spe- cific number of clicks from the fully turned-in position.
3-30 CHASSIS • The I.D. mark "a" is marked at the end of the spring. • Spring specification varies according to the difference in the production lot. 3. Adjust: • Spring preload Adjustment steps: a. Loosen the locknut "1". b.
3-31 CHASSIS ADJUSTING THE REAR SHOCK ABSORBER LOW COMPRESSION DAMPING FORCE 1. Adjust: • Low compression damping force By turning the adjuster "1". • STANDARD POSITION: This is the position which is back by the spe- cific number of clicks from the fully turned-in position.
3-32 CHASSIS • STANDARD POSITION: This is the position which is back by the spe- cific number of turns from the fully turned-in position. (Which align the punch mark "a" on the adjuster with the punch mark "b" on the adjuster body.
3-33 CHASSIS CHECKING THE WHEELS 1. Inspect: • Wheel runout Elevate the wheel and turn it. Abnormal runout → Replace. 2. Inspect: • Bearing free play Exist play → Replace. CHECKING AND ADJUSTING THE STEERING HEAD 1. Place a stand under the engine to raise the front wheel off the ground.
3-34 CHASSIS e. Loosen the steering ring nut one turn. f. Retighten the steering ring nut using the steering nut wrench. Avoid over-tightening. g. Check the steering stem by turning it lock to lock. If there is any binding, remove the steering stem assembly and inspect the steering bearings.
3-35 CHASSIS LUBRICATION.
3-36 CHASSIS To ensure smooth operation of all componen ts, lubricate your machine during setup, after break-in, and after every race. 1. All control cable 2. Clutch lever pivot 3. Shift pedal pivot 4. Footrest pivot 5. Throttle-to-handlebar conta ct 6.
3-37 ELECTRICAL ELECTRICAL CHECKING THE SPARK PLUG 1. Remove: • Spark plug 2. Inspect: • Electrode "1" Wear/damage → Replace. • Insulator color "2" Normal condition is a medium to ligh t tan color. Distinctly different color → Check the engine condition.
3-38 ELECTRICAL 4. Check: • Ignition timing Visually check the stationary pointer "a" is within the firing range "b" on the rotor. Incorrect firing range → Check rotor and Crankshaft position sensor. 5. Install: • Timing mark accessing screw Timing mark accessing screw: 6 Nm (0.
3-39 TROUBLESHOOTING TROUBLESHOOTING The following guide for troub leshooting does not cover all the possible causes of proble ms. If the fol- lowing problems occur, perform the specified checks or maintenan ce jobs.
3-40 TROUBLESHOOTING INSPECTION STEPS If the aforementioned problems have occurred, perform the following insp ection steps in the order given. Check that the fuel tank is filled with fresh gasoline. No good → Fill the fuel tank. OK ↓ Check that the fuel tank breather hose is not clogged.
4-1 SEAT AND SIDE COVERS ENGINE This section is intended for those who have basic knowledge and skill concerning the se rvicing of Yamaha motorcycles (e.
4-2 SEAT AND SIDE COVERS REMOVING THE NUMBER PLATE 1. Remove: • Bolt (number plate) • Number plate "1" • The projection "a" is inserted into the band of the number plate. Pull the band off the projec- tion before removal. • Remove the clutch cable "2" from the cable guide "b" on the number plate.
4-3 EXHAUST PIPE AND SILENCER EXHAUST PIPE AND SILENCER REMOVING THE EXHAUST PIPE AND SILENCER Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section. Side cover (left and right) Refer to "SEAT AND SIDE COV- ERS" section.
4-4 EXHAUST PIPE AND SILENCER 10 Exhaust pipe 1 1 11 Gasket 3 12 Heat protector 1 Order Part name Q 'ty Remarks.
4-5 EXHAUST PIPE AND SILENCER CHECKING THE SILENCER AND EXHAUST PIPE 1. Inspect: •G a s k e t " 1 " Damage → Replace. CHANGING THE SILENCER FIBER For USA and CDN 2. Remove: •B o l t " 1 " • Inner pipe "2" Do not hit the silencer stay " a" as it may do damage to the silencer.
4-6 EXHAUST PIPE AND SILENCER Except for USA and CDN 1. Remove: • Rivet (front) "1" • Inner pipe "2" • Take care not to damage the rivet fitting holes (ø4.9 mm) "a" in removal. • Do not hit the silencer stay "b" as it may do damage to the silencer.
4-7 EXHAUST PIPE AND SILENCER 2. Install: • Silencer clamp (front) • Eexhaust pipe 2 "1" • Bolt (exhaust pipe 2) "2" Install and temporarily tighten the exhaust pipe 2 with its end positioned as shown with respect to the exhaust pipe 1.
4-8 RADIATOR RADIATOR REMOVING THE RADIATOR Order Part name Q 'ty Remarks Drain the coola nt. Refer to "CHANGING THE COOL- ANT" section in the CHAPTER 3. Seat Refer to "SEAT AND SIDE COV- ERS" section. Fuel tank Refer to "FUEL TANK" section in the CHAPTER 6.
4-9 RADIATOR 8 Radiator breather hose 1 9 Left radiator 1 10 Radiator hose 1 1 11 Pipe 1/O-ring 1/1 Order Part name Q 'ty Remarks.
4-10 RADIATOR HANDLING NOTE Do not remove the radiator cap when th e en- gine and radiator are hot. Scalding ho t fluid and steam may be blown out under pres - sure, which could cause serious injury.
4-11 RADIATOR 4. Install: • Radiator breather hose "1" • Right radiator "2" Refer to "CABLE ROUTING DIAGRAM" section in the CHAPTER 2. 5. Install: • Radiator guard "1" First fit the inner hook portion "a" and then the outer one "b" onto the radiator.
4-12 CAMSHAFTS CAMSHAFTS REMOVING THE CYLINDER HEAD COVE R Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section. Fuel tank Refer to "FUEL TANK" section in the CHAPTER 6. Cover Refer to "THROTTLE BODY" section in the CHAPT ER 6.
4-13 CAMSHAFTS REMOVING THE CAMSHAFTS Order Part name Q 'ty Remarks 1 Timing mark accessing screw 1 Refer to removal section. 2 Crankshaft end accessing screw 1 Refer to removal section. 3 Timing chain tensioner cap bolt 1 Refer to removal section.
4-14 CAMSHAFTS REMOVING THE CAMSHAFT 1. Remove: • Timing mark accessing screw "1" • Crankshaft end accessing screw "2" 2. Align: • Alignmen mark Checking steps: a.
4-15 CAMSHAFTS CHECKING THE CAMSHAFT 1. Inspect: • Cam lobe Pitting/scratches/blue discoloration → Re- place. 2. Measure: • Cam lobe length "a" and "b" Out of specification → Replace. 3. Measure: • Runout (camshaft) Out of specific ation → Replace.
4-16 CAMSHAFTS c. Inst all the clip, dowel pins and camshaft caps. • Tighten the bolts (camshaft cap) in a criss- cross pattern from innermost to outer cap s. • Do not turn the camshaft when measuring clearance with the Plastigauge ® . d. Remove the camshaft cap s and measure the width of the Plastigauge ® "1".
4-17 CAMSHAFTS INSTALLING THE CAMSHAFT 1. Install: • Exhaust camshaft "1" • Intake camshaft "2" Installation steps: a. Turn the crankshaft counterclockwise with a wrench. • Apply the molybdenum disulfide oil on the camshafts.
4-18 CAMSHAFTS d. Install the clips, camshaft caps "4" and bolts (camshaft cap) "5". • Before installing the clips, cover the cylinder head with a clean rag to prevent the clips from into the cylinder head cavity. • Tighten the bolts to the specified torque in two or three steps in the proper tighte ning se- quence as shown.
4-19 CYLINDER HEAD CYLINDER HEAD REMOVING THE CYLINDER HEAD Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section. Fuel tank Refer to "FUEL TANK" section in the CHAPTER 6. Exhaust pipe and silencer Refer to "EXHAUST PIPE AND SI- LENCER" section.
4-20 CYLINDER HEAD Tighten the cylinder head bolts to 30 Nm (3.0 m•kg , 22 ft•b) in the proper tightening seque nce, re- move and retighten the cylinder head bo lts to 20 Nm (2.
4-21 CYLINDER HEAD CHECKING THE CYLINDER HEAD 1. Eliminate: • Carbon deposits (from the combustion chambers) Use a rounded scraper. Do not use a sharp instrument to avoid damag- ing or scratching: • Spark plug threads • Valve seats 2. Inspect: • Cylinder head Scratches/damage → Replace.
4-22 CYLINDER HEAD a. Wash the threads and contact surfaces of the bolts, the contact surfaces of the plain washers, the co ntact surface of the cylinder head, and the threads of the crankcase. b. Apply the molybdenum disulfide grease on the threads and contact surfaces of the bolts and on both contact surfaces of the p lain washers.
4-23 VALVES AND VALVE SPRINGS VALVES AND VALVE SPRINGS REMOVING THE VALVES AND VALV E SPRINGS Order Part name Q 'ty Remarks Cylinder head Refer to "CYLINDER HEAD" section. 1 Valve lifter 4 Refer to removal section. 2 Adjusting pad 4 Refer to removal section.
4-24 VALVES AND VALVE SPRINGS REMOVING THE VALVE LIFTER AND VALVE COTTER 1. Remove: • Valve lifter "1" • Pad "2" Identify each lifter "1" and pad "2" position very carefully so that they can be reinstalled in their original place.
4-25 VALVES AND VALVE SPRINGS 2. Replace: • Valve guide Replacement steps: To ease guide removal, installation and to maintain correct fit heat the cylinder head in an over to 100 °C (212 °F). a. Remove the valve guide using a valve guide remover "1".
4-26 VALVES AND VALVE SPRINGS 5. Measure: • Runout (valve stem) Out of specification → Replace. • When installing a new valve always replace the guide. • If the valve is removed or replaced always re- place the oil seal. 6. Eliminate: • Carbon deposits (from the valve face and valve seat) 7.
4-27 VALVES AND VALVE SPRINGS b. Apply molybdenum disulfide oil to the valve stem. c. Inst all the valve into the cylinder head. d. Turn the valve until the valve face and valve seat are evenly polished, the n clean off all of the compound.
4-28 VALVES AND VALVE SPRINGS 3. Measure: • Spring tilt "a" Out of specification → Replace. CHECKING THE VALVE LIFTERS 1. Inspect: • Valve lifter Scratches/damage → Replace both lifters and cylinder head. INSTALLING THE VALVES 1. Apply: • Molybdenum disulfide oil Onto the valve stem and valve stem se al.
4-29 VALVES AND VALVE SPRINGS 4. To secure the valve cotters onto the valve stem, lightly tap the valve tip with a piece of wood. Hitting the valve tip with excessive forc e could damage the valve. 5. Install: • Adjusting pad "1" • Valve lifter "2" • Apply the molybdenum disulfide oil on the valve stem end.
4-30 CYLINDER AND PISTON CYLINDER AND PISTON REMOVING THE CYLINDER AND PISTON Order Part name Q 'ty Remarks Cylinder head Refer to "CYLINDER HEAD" section. 1 Bolt (cylinder) 1 2 Cylinder 1 3G a s k e t 1 4 Dowel pin 2 5 Piston pin clip 2 Refer to removal section.
4-31 CYLINDER AND PISTON REMOVING THE PISTON AND PISTON RING 1. Remove: • Piston pin clip "1" • Piston pin "2" •P i s t o n " 3 " • Put identification marks on each piston head for reference during reinstallation.
4-32 CYLINDER AND PISTON b. If out of specification, repla ce the cylinder, and replace the piston and piston rings as set. c. Measure th e piston skirt diameter "P" with a micrometer. a. 9 mm (0.35 in) from the piston bottom edge d. If out of specification, repla ce the piston and piston rings as a set.
4-33 CYLINDER AND PISTON CHECKING THE PISTON PIN 1. Inspect: • Piston pin Blue discoloration/grooves → Replace, then inspect the lubrication system. 2. Measure: • Piston pin-to-piston clearance Measurement steps: a. Measure the outside diameter (piston pin) "a".
4-34 CYLINDER AND PISTON 3. Install: •P i s t o n " 1 " • Piston pin "2" • Piston pin clip "3" • Apply engine oil onto the piston. • Apply molybdenum disulfide oil onto the pis- ton pin. • Install the piston with the F mark "a" on it pointing to its intake (front) side.
4-35 CLUTCH CLUTCH REMOVING THE CLUTCH Order Part name Q 'ty Remarks Drain the engine oil. Refer to "CHANGING THE ENGINE OIL" section in the CHAPTER 3. Brake pedal Refer to "ENGINE REMOVAL" sec- tion. Clutch cable Disconnect at engine side.
4-36 CLUTCH 11 Clutch plate 7 12 Friction plate 8 13 Nut (clutch boss) 1 Refer to removal section. 14 Conical washer 1 Refer to removal section. 15 Clutch boss 1 Refer to removal section.
4-37 CLUTCH REMOVING THE CLUTCH BOSS 1. Remove: •N u t " 1 " • Conical washer "2" • Clutch boss "3" Use the clutch hold ing tool "4" to hold the clutch boss. A. For USA and CDN B. Except for USA and CDN CHECKING THE CLUTCH HOUSING AND BOSS 1.
4-38 CLUTCH CHECKING THE CLUTCH PLATES 1. Measure: • Clutch plate warpage Out of specification → Replace clutch plate as a set. Use a surface plate "1 " and thickness gauge "2". CHECKING THE PUSH LEVER SHAFT 1. Inspect: • Push lever shaft "1" Wear/damage → Replace.
4-39 CLUTCH 2. Install: • Conical washer "1" • N ut (clutch boss) "2" Make sure to tighten t o specification; other- wise, it may damage the other part that i s fastened together. • Apply engine oil to the threads and contact surface of the clutch boss nut.
4-40 CLUTCH 5. Install: • Push rod 2 "1" • Ball "2" • Push rod 1 "3" Apply the engine oil on the push rod 1, 2 and ball. 6. Install: • Pressure plate "1" 7. Install: • Clutch spring • Bolt (clutch spring) Tighten the bolts in stage, using a crisscross pattern.
4-41 OIL FILTER ELEMENT AND WATER PUMP OIL FILTER ELEMENT AND WATER PUMP REMOVING THE OIL FILTER ELEMENT AND WATER PUMP Order Part name Q 'ty Remarks Right engine guard Refer to "ENGINE REMOVAL" sec- tion. Drain the engine oil. Refer to "CHANGING THE ENGINE OIL" section in the CHAPTER 3.
4-42 OIL FILTER ELEMENT AND WATER PUMP 5 Dowel pin 2 6 Kickstarter crank 1 7 Right crankcase cover 1 8G a s k e t 1 9 Dowel pin/O-ring 3/1 10 Impeller 1 Refer to removal section. 11 Washer 1 Refer to removal section. 12 Impeller shaft 1 Refer to removal section.
4-43 OIL FILTER ELEMENT AND WATER PUMP REMOVING THE IMPELLER SHAFT 1. Remove: • Impeller "1" •W a s h e r " 2 " • Impeller shaft "3" Hold the impeller shaft on its width across the flats "a" with spanners, etc.
4-44 OIL FILTER ELEMENT AND WATER PUMP CHECKING THE BEARING 1. Inspect: • Bearing Rotate inner race with a finger. Rough spot/seizure → Replace. CHECKING THE OIL SEAL 1. Inspect: •O i l s e a l " 1 " Wear/damage → Replace. INSTALLING THE OIL SEAL 1.
4-45 OIL FILTER ELEMENT AND WATER PUMP INSTALLING THE RIGHT CRANKCASE COVER 1. Install: • D owel pin "1" • O-ring "2" • Collar "3" • Gasket "4" Apply the lithium soap base grease on the O- ring.
4-46 OIL FILTER ELEMENT AND WATER PUMP INSTALLING THE WATER PUMP HOUSING 1. Install: • D owel pin "1" • Gasket "2" 2. Install: • Water pump housing "1" • Bolt (water pump housing) "2" • Washer "3" • Coolant drain bolt "4" 3.
4-47 BALANCER BALANCER REMOVING THE BALANCER Order Part name Q 'ty Remarks Primary driven gear Refer to "CLUTCH" section. Right crankcase cover Refer to "OIL FILTER ELEMENT AND WATER PUMP" section. Stator Refer to "AC MAGNETO" section.
4-48 BALANCER 11 Balancer shaft driven gear 1 Order Part name Q 'ty Remarks.
4-49 BALANCER REMOVING THE BALANCER 1. Straighten the lock washer tab. 2. Loosen: • Nut (balancer) "1" • Nut (primary drive gear) "2" • Nut (balancer shaft driven gear) "3" Place an aluminum plate "a" between the teeth of the balancer shaft drive gear "4" and driven gear "5".
4-50 BALANCER 2. Install: • Balancer shaft driven gear "1" • Align the punched mark "a" on the balancer shaft drive gear with the punch ed mark "b" on the balancer shaft driven gear. • Install the balancer shaft driven gear and crankshaft with the lower splines "c" aligning with each other.
4-51 OIL PUMP OIL PUMP REMOVING THE OIL PUMP Order Part name Q 'ty Remarks Primary driven gear Refer to "CLUTCH" section. Right crankcase cover Refer to "OIL FILTER ELEMENT AND WATER PUMP" section.
4-52 OIL PUMP 12 Inner rotor 1 1 13 Dowel pin 1 14 Washer 1 15 Oil pump drive shaft 1 16 Rotor housing 1 Order Part name Q 'ty Remarks.
4-53 OIL PUMP CHECKING THE OIL PUMP 1. Inspect: • Oil pump drive gear • Oil pump drive shaft • Rotor housing • Oil pump cover Cracks/wear/damage → Replace.
4-54 OIL PUMP 3. Install: • Oil pump cover "1" • Screw (oil pump cover) "2" • D owel pin "3" • Inner rotor 2 "4" • Circlip "5" • Apply the engine oil on the oil pump drive shaft end and inner rotor 2.
4-55 KICK SHAFT AND SHIFT SHAFT KICK SHAFT AND SHIFT SHAFT REMOVING THE KICK SHAFT AND SHIFT SHAFT Order Part name Q 'ty Remarks Oil pump Refer to "OIL PUMP" section. 1 K ick idle gear 1 2 Kick shaft assembly 1 Refer to removal section.
4-56 KICK SHAFT AND SHIFT SHAFT 14 Shift guide 1 Refer to removal section. 15 Shift lever assembly 1 Refer to removal section. 16 Shift lever 1 17 Pawl 2 18 Pawl pin 2 19 Spring 2 20 Bolt (stopper lever) 1 21 Stopper lever 1 22 Torsion spring 1 23 Segment 1 Refer to removal section.
4-57 KICK SHAFT AND SHIFT SHAFT REMOVING THE KICK SHAFT ASSEMBLY 1. Remove: • Kick shaft assembly "1" Unhook the torsion spring "2" from the hole "a" in the crankcase. REMOVING THE SHIFT GUIDE AND SHIFT LEVER ASSEMBLY 1.
4-58 KICK SHAFT AND SHIFT SHAFT CHECKING THE SHIFT SHAFT 1. Inspect: • Shift shaft "1" Bend/damage → Replace. • Spring "2" Broken → Replace.
4-59 KICK SHAFT AND SHIFT SHAFT INSTALLING THE SHIFT GUIDE AND SHIFT LEVER ASSEMBLY 1. Install: • Spring "1" • Pawl pin "2" •P a w l " 3 " To shift lever "4". Apply the engine oil on the spring, pawl pin and pawl.
4-60 KICK SHAFT AND SHIFT SHAFT INSTALLING THE KICK SHAFT ASSEMBLY 1. Install: • Kick gear "1" •W a s h e r " 2 " • Circlip "3" • Ratchet wheel "4" • Spring "5" •W a s h e r " 6 " • Circlip "7" To kick shaft "8".
4-61 KICK SHAFT AND SHIFT SHAFT 5. Hook: • Torsion spring "1" Turn the torsion spring clockwise and hook into the proper hole "a" in the cra nkcase.
4-62 AC MAGNETO AC MAGNETO REMOVING THE AC MAGNETO Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section. Fuel tank Refer to "FUEL TANK" section in the CHAPER 6. Disconnect the AC magneto lead 1 Left crankcase c over 1 2G a s k e t 1 3 Dowel pin 2 4 Nut (rotor) 1 Refer to removal section.
4-63 AC MAGNETO REMOVING THE ROTOR 1. Remove: • Nut (rotor) "1" •W a s h e r 2. Remove: •R o t o r " 1 " Use the rotor puller 2. CHECKING THE AC MAGNETO 1. Inspect: • Rotor inner surface "a" • Stator outer surface "b" Damage → Inspect the crankshaft runout and crankshaft bearing.
4-64 AC MAGNETO 2. Install: • Woodruff key "1" •R o t o r " 2 " • Degrease the contact surfaces of the tapered portions of the crankshaft and rotor. • When installing the woodruff key, make sure that its flat surface "a" is in parallel with the crankshaft center line "b".
4-65 ENGINE REMOVAL ENGINE REMOVAL REMOVING THE ELECTRONIC PARTS Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the frame. Refer to "HANDLING NOTE". Seat Refer to "SEAT AND SIDE COV- ERS" section.
4-66 ENGINE REMOVAL REMOVING THE ENGINE Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the frame. Refer to "HANDLING NOTE". Throttle body Refer to "THROTTLE BODY" section in the CHAPRE 6. Rear fender Refer to "SEAT AND SIDE COV- ERS" section.
4-67 ENGINE REMOVAL 3 Lock washer 1 Refer to removal section. 4 Drive sprocket 1 Refer to removal section. 5C l i p 1 6 Bolt (brake pedal) 1 7 Brake pedal 1 8 Upper engine bracket 2 9 Lower engine bracket 2 10 Engine mounting bolt 4 11 Pivot shaft 1 Refer to removal section.
4-68 ENGINE REMOVAL HANDLING NOTE Support the machine securely so there is no danger of it falling over. REMOVING THE DRIVE SPROCKET 1. Remove: • Nut (drive sprocket) "1" • Lock washer "2" • Straighten the lock washer tab. • Loosen the nut while applying the rear brake.
4-69 ENGINE REMOVAL • Upper engine bracket "8" • Bolt (upper engine bracket) "9" • Engine mounting bolt (upper) "10" • Apply the molybdenum disulfide grease on the pivot shaft. • Install the patch with the claw "a" facing out- side the chassis.
4-70 ENGINE REMOVAL 3. Bend the lock washer tab to lock the nut. 4. Install: • Drive chain sprocket guide • Drive chain sprocket cover "1" • Bolt(drive chain sprocket cover) "2" Bolt (drive chain sprocket cover): 7 Nm (0.7 m•kg, 5.
4-71 CRANKCASE AND CRANKSHAFT CRANKCASE AND CRANKSHAFT REMOVING THE CRANKSHAFT Order Part name Q 'ty Remarks Engine Refer to "ENGINE REMOVAL" sec- tion. Piston Refer to "CYLINDER AND PISTON" section. Balancer Refer to "BALANCER" section.
4-72 CRANKCASE AND CRANKSHAFT 6 Bolt [L = 70 mm (2.76 in)] 4 Refer to removal section. 7 Right crankcase 1 Refer to removal section. 8 Left crankcase 1 Refer to removal section. 9 Oil strainer 1 10 Balancer shaft 1 Refer to removal section. 11 Crankshaft 1 Refer to removal section.
4-73 CRANKCASE AND CRANKSHAFT REMOVING THE CRANKCASE BEARIN G Order Part name Q 'ty Remarks Transmission Refer to "TRANSMISSION, SHIFT CAM AND SHIFT FORK" section. Shift cam and shift fork Refer to "TRANSMISSION, SHIFT CAM AND SHIFT FORK" section.
4-74 CRANKCASE AND CRANKSHAFT DISASSEMBLING THE CR ANKCASE 1. Separate: • Right crankcase • Left crankcase Separation steps: a. Remove the crankcase bolts, hose guide and clutch cable holder. Loosen each bolt 1/4 of a turn at a time and af- ter all the bolts are loosened, remove them.
4-75 CRANKCASE AND CRANKSHAFT REMOVING THE CRANKCASE BEARIN G 1. Remove: • Bearing "1" • Remove the bearing from the crankcase by pressing its inner race. • Do not use the removed bearing. CHECKING THE TIMING CHAIN AND TIMING CHAIN GUIDE 1.
4-76 CRANKCASE AND CRANKSHAFT CHECKING THE OIL STRAINER 1. Inspect: • Oil strainer Damage → Replace. INSTALLING THE CRANKCASE BEARING 1. Install: •B e a r i n g • Bearing stopper • Bolt (bearing stopper) • Screw (bearing stopper) • Screw [bearing stopper (crankshaft)] "1" To left and right crankcase.
4-77 CRANKCASE AND CRANKSHAFT • Hold the connecting rod at top dead center with one hand while turning the nut of the in- stalling tool with the other. Operate the install- ing tool until the crankshaft bottoms against the bearing. • Before installing the crankshaft, clean the contacting surface of crankcase.
4-78 CRANKCASE AND CRANKSHAFT 5. Install: • D owel pin "1" • Right crankcase To left crankcase. • Fit the right crankcase onto the left crankcase. Tap lightly on the case with soft hammer. • W hen installing the crankcase, the connecting rod should be positioned at TDC (top dead center).
4-79 TRANSMISSION, SHIFT CAM AND SHIFT FORK TRANSMISSION, SHIFT CAM AND SHIFT FORK REMOVING THE TRANSMISSION, SHIFT CAM AND SHIFT FORK Order Part name Q 'ty Remarks Engine Refer to "ENGINE REMOVAL" sec- tion. Separate the crankcase. Refer to "CRANKCASE AND CRANKSHAFT" section.
4-80 TRANSMISSION, SHIFT CAM AND SHIFT FORK REMOVING THE TRANSMISSION 1. Remove: • Main axle "1" •D r i v e a x l e " 2 " • Shift cam • Shift fork 3 • Shift fork 2 • Shift fork 1 • Remove assembly with the collar "3" installed to the crankcase.
4-81 TRANSMISSION, SHIFT CAM AND SHIFT FORK 2. Inspect: • Shift cam "1" • Segment "2" Wear/damage → Replace. 3. Check: • Shift fork movement Unsmooth operation → Replace shift fork. For a malfunctioning shift fork, replace not only the shift fork itself but the two gears each adja- cent to the shift fork.
4-82 TRANSMISSION, SHIFT CAM AND SHIFT FORK 3. Install: •W a s h e r " 1 " • Circlip "2" • Be sure the circlip sharp-edged corner "a" is positioned opposite side to the washer and gear "b". • Install the circlip with its ends "c" sett led even- ly on the spline crests.
4-83 TRANSMISSION, SHIFT CAM AND SHIFT FORK 6. Install: • Transmission assembly "1" To left crankcase "2". Apply the engine oil on th e bearings and guide bars. 7. Check: • Shifter operation • Transmission operation Unsmooth operation → Repair.
5-1 CHASSIS This section is intended for those who have basic knowledge and skill concerning the se rvicing of Yamaha motorcycles (e.g., Yamaha dealers, service e ngineers, etc.
5-2 FRONT WHEEL AND REAR WHEEL FRONT WHEEL AND REAR WHEEL REMOVING THE FRONT WHEEL Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". 1 Bolt (axle holder) 4 Only loosening.
5-3 FRONT WHEEL AND REAR WHEEL REMOVING THE REAR WHEEL Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". 1 Nut (rear wheel axle) 1 2 R ear wheel axle 1 3 Drive chain puller 2 4 Rear wheel 1 Refer to removal section.
5-4 FRONT WHEEL AND REAR WHEEL HANDLING NOTE Support the machine securely so there is no danger of it falling over. REMOVING THE REAR WHEEL 1. Remove: • Wheel "1" Push the wheel forward and remove the d rive chain "2". REMOVING THE WHEEL BEARING 1.
5-5 FRONT WHEEL AND REAR WHEEL CHECKING THE BRAKE DISC 1. Measure: • Brake disc deflection (only rear brake disc) Use the dial gauge "1". Out of specification → Inspect wheel runout. If wheel runout is in good condition, replace the brake disc.
5-6 FRONT WHEEL AND REAR WHEEL 3. Install: • Collar "1" • Apply the lithium soap base grease on the oil seal lip. • Install the collars with their projections "a" fac- ing the wheel. 4. Install: • Wheel Install the brake disc "1" between the brake pads "2" correctly.
5-7 FRONT WHEEL AND REAR WHEEL INSTALLING THE REAR WHEEL 1. Install: • Bearing (right) "1" • Circlip "2" • Spacer "3" • Bearing (left) "4" • Oil seal "5" • Apply the lithium soap base grease on the bearing and oil seal lip when installing.
5-8 FRONT WHEEL AND REAR WHEEL 5. Install: • Wheel Install the brake disc "1" between the brake pads "2" correctly. 6. Install: • D rive chain "1" Push the wheel "2" forward and install the dr ive chain.
5-9 FRONT BRAKE AND REAR BRAKE FRONT BRAKE AN D REAR BRAKE REMOVING THE FRONT BRAKE Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". Drain the brake fluid. Refer to removal section.
5-10 FRONT BRAKE AND REAR BRAKE REMOVING THE REAR BRAKE Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". Rear wheel Refer to "FRONT WHEEL AND REAR WHEEL" section.
5-11 FRONT BRAKE AND REAR BRAKE DISASSEMBLING THE BRAKE CALIPER Order P art name Q'ty Remarks A. Front B. Rear AB 1P a d p i n 1 1 2B r a k e p a d 2 2 3 P ad suppor t 1 1 4 Brake caliper piston 2 1 Refer to removal section. 5 Brake caliper piston dust seal 2 1 Refer to removal section.
5-12 FRONT BRAKE AND REAR BRAKE DISASSEMBLING THE BRAKE MASTER CYLINDER Order Part name Q 'ty Remarks A. Front B. Rear 1 Brake master cylinder cap 1 2 Diaphragm 1 3 Reservoir float 1 4 Push rod (front) 1 5 Brake master cylinder boot 1 6 Circlip 1 Use a long nose circlip pliers.
5-13 FRONT BRAKE AND REAR BRAKE HANDLING NOTE Support the machine securely so there is no danger of it falling over. DRAINING THE BRAKE FLUID 1. Remove: • Brake master cylinder cap "1" • Protector (rear brake) Do not remove the diaphragm.
5-14 FRONT BRAKE AND REAR BRAKE Remove the brake caliper piston seals and brake caliper piston dust seals b y pushing them with a finger. Never attempt to pry out brake caliper pis- ton seals and brake caliper piston dust seals. Replace the brake caliper piston se als and brake caliper piston dust seals whenever a caliper is disassembled.
5-15 FRONT BRAKE AND REAR BRAKE CHECKING THE BRAKE CALIPER 1. Inspect: • Brake caliper cylinder inner surface "a" Wear/score marks → Replace brake caliper assembly. A. Front B. Rear 2. Inspect: • Brake caliper piston "1" Wear/score marks → Replace brake caliper piston assembly.
5-16 FRONT BRAKE AND REAR BRAKE A. Front B. Rear 3. Install: • Brake caliper piston "1" Apply the brake fluid on the piston wa ll. • Install the piston with its shallow de- pressed side "a" facing the brake calip er. • Never force to insert.
5-17 FRONT BRAKE AND REAR BRAKE 2. Install: • Brake disc cover "1" • Bolt (brake disc cover) "2" 3. Install: • Brake caliper "1" • Rear wheel "2" Refer to "FRONT WHEEL AND REAR WHEEL" s ection.
5-18 FRONT BRAKE AND REAR BRAKE 4. Install: • Brake master cylinder kit "1" • Washer (front brake) "2" • Push rod (rear brake) "2" •C i r c l i p " 3 " • Brake master cylinder boot "4" • Push rod (front brake) "5" To brake master cylinder.
5-19 FRONT BRAKE AND REAR BRAKE INSTALLING THE REAR BRAKE MASTER CYLINDER 1. Install: • Copper washer "1" • Brake hose "2" • U nion bolt "3" Always use new copper washers.
5-20 FRONT BRAKE AND REAR BRAKE INSTALLING THE FRONT BRAKE HOSE 1. Install: • Copper washer "1" • Brake hose "2" • U nion bolt "3" Always use new copper washers.
5-21 FRONT BRAKE AND REAR BRAKE INSTALLING THE REAR BRAKE HOSE 1. Install: • Copper washer "1" • Brake hose "2" • U nion bolt "3" Always use new copper washers.
5-22 FRONT BRAKE AND REAR BRAKE Brake fluid may erode painte d surfaces or plastic parts. Always clean up spilled fluid immediately. A. Front B. Rear 2. Air bleed: • Brake sy stem Refer to "BLEEDING THE HYDRAULIC BRAKE SYSTEM" section in the CHAPTER 3.
5-23 FRONT FORK FRONT FORK REMOVING THE FRONT FORK Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". Front wheel Refer to "FRONT WHEEL AND REAR WHEEL" section.
5-24 FRONT FORK DISASSEMBLING THE FRONT FORK Order Part name Q 'ty Remarks 1A d j u s t e r 1 Drain the fork oil. Refer to removal section. 2 Fork spring 1 3 Dust seal 1 Refer to removal section. 4 Stopper ring 1 Refer to removal section. 5 Inner tube 1 Refer to removal section.
5-25 FRONT FORK HANDLING NOTE Support the machine securely so there is no danger of it falling over. The front fork requires careful attention. So it is recommended that the front fork be maintain ed at the dealers.
5-26 FRONT FORK REMOVING THE INNER TUBE 1. Remove: • Dust seal "1" • Stopper ring "2" Using slotted-head screwdriver. Take care not to scratch the inner tube.
5-27 FRONT FORK CHECKING THE COLLAR 1. Inspect: • Piston metal "1" Wear/damage → Replace. CHECKING THE FORK SPRING 1. Measure: • Fork spring free length "a" Out of specification → Replace. CHECKING THE INNER TUBE 1. Inspect: • Inner tube surface "a" Score marks → Repair or replace.
5-28 FRONT FORK CHECKING THE ADJUSTER 1. Inspect: • Adjuster "1" • O-ring "2" Wear/damage → Replace. ASSEMBLING THE FRONT FORK 1. Wash the all parts in a clean solvent. 2. Stretch the damper assembly fu lly. 3. Fill: • Front fork oil "1" To damper assembly.
5-29 FRONT FORK 7. Loosen: • Compression damping adjuster "1" • Loosen the compression damping adjuster finger tight. • Record the set position of the adjuster (the amount of turning out the fully turned in posi- tion). 8. Install: • Base valve "1" To damper assembly "2".
5-30 FRONT FORK 13.Allow the overflowing oil to escape at the hole "a" in the damper assembly. 14.Check: • Damper assembly smooth movement Tightness/binding/rough spots → Repeat the steps 2 to 13.
5-31 FRONT FORK 18.Install: • Slide metal "1" • Oil seal washer "2" To outer tube slot. Press the slide metal into the outer tube with fork seal driver "3". 19.Install: •O i l s e a l " 1 " Press the oil seal into the outer tub e with fork seal driver "2".
5-32 FRONT FORK 23.Measure: • Distance "a" Out of specification → Turn into the locknut. 24.Install: • Collar "1" • Fork spring "2" To damper assembly "3". Install the collar with its larger dia. end "a" fac- ing the fork spring.
5-33 FRONT FORK 28.Inspect: • Gap "a" between the adjuster "1" and lock- nut "2". Out of specification → Retight en and read- just the locknut. If the adjuster is installe d out of specification, proper damping force cannot be obtained.
5-34 FRONT FORK 32.Install: • Damper assembly "1" To outer tube. Temporarily tighten the damper assembly. 33.Install: • Protector guide "1" INSTALLING THE FRONT FORK 1. Install: • Front fork "1" • Temporarily tighten the pinch bolts (lower bracket).
5-35 FRONT FORK 5. Install: • Protector "1" • Bolt (protector) "2" 6. Adjust: • Rebound damping force Turn in the damping adjuster "1" finge r-tight and then turn out to the originally set position.
5-36 HANDLEBAR HANDLEBAR REMOVING THE HANDLEBAR Order Part name Q 'ty Remarks Number plate Remove the band only. 1 Clutch cable 1 Disconnect at the lever side. 2 Clutch lever holder 1 3 E ngine sto p switch 1 4 Brake master cylinder 1 Refer to removal section.
5-37 HANDLEBAR 14 Handlebar lower holder 2 15 Cap 1 Order Part name Q 'ty Remarks.
5-38 HANDLEBAR REMOVING THE BRAKE MASTER CYLINDER 1. Remove: • Brake master cylinder bracket "1" • Brake master cylinder "2" • Do not let the brake master cylinder hang on the brake hose. • Keep the brake master cylinder cap side horizontal to prevent air from coming in.
5-39 HANDLEBAR 2. Install: • Handlebar "1" • Handlebar upper holder "2" • Bolt (handlebar upper holder) "3" • The handlebar upper holder should be in- stalled with the punched mark "a" forward. • Install the handlebar so that the marks "b" are in place on both sides.
5-40 HANDLEBAR 5. Install: • Right grip "1" • Collar "2" Apply the adhesive on the tube guide "3". • Before applying the adhes ive, wipe off grease or oil on the tube guide surface "a" with a lac- quer thinner.
5-41 HANDLEBAR 9. Install: • Grip cap cover "1" • Cover (throttle cable cap) "2" 10.Install: • Brake master cylinder "1" • Brake master cylinder bracket "2" • Bolt (brake master cylinder bracket) "3" • Install the bracket so that the arrow mark "a" faces upward.
5-42 STEERING STEERING REMOVING THE STEERING Order Part name Q 'ty Remarks TIGHTENING STEPS: • Tighten ring nut. 38 Nm (3.8 m•kg, 27 ft•lb) • Loosen it one turn. • Retighten it. 7 Nm (0.7 m•kg, 5.1 ft•lb) Hold the machine by placing the suit- able stand under the en gine.
5-43 STEERING 6 Lower bracket 1 7 B earing race cover 1 8 Upper bearing 1 9 Lower bearing 1 Refer to removal section. 10 Bearing race 2 Refer to removal section.
5-44 STEERING HANDLING NOTE Support the machine securely so there is no danger of it falling over. REMOVING THE STEERING RING NUT 1. Remove: • Steering ring nut "1" Use the steering nut wrench "2". Support the steering stem so that it may not fall down.
5-45 STEERING INSTALLING THE LOWER BRACKET 1. Install: • Lower bearing "1" Apply the lithium soap base grease on the dust seal lip and bearing inner circumference.
5-46 STEERING 7. Install: • Front fork "1" • Upper bracket "2" • Temporarily tighten the pinch bolts (lower bracket). • Do not tighten the pinch bolts (upper bracket) yet.
5-47 SWINGARM SWINGARM REMOVING THE SWINGARM Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". Brake hose holder Refer to "FRONT BRAKE AND REAR BRAKE" section.
5-48 SWINGARM DISASSEMBLING THE SWINGARM Order Part name Q 'ty Remarks 1 Relay arm 1 2 Connecting rod 1 3 Collar 2 4O i l s e a l 2 5 Thrust bearing 2 6 Bushing 2 7O i l s e a l 8 8 B earing 10 Refer to removal section.
5-49 SWINGARM HANDLING NOTE Support the machine securely so there is no danger of it falling over. REMOVING THE BEARING 1. Remove: • Bearing "1" Remove the bearing b y pressing its outer race.
5-50 SWINGARM 2. Install: • Bearing "1" •W a s h e r " 2 " •O i l s e a l " 3 " To relay arm. • Apply the molybdenum disulfide grease on the bearing when installing. • Install the bearing by pressing it on the side having the manufacture's marks or numbers.
5-51 SWINGARM INSTALLING THE SWINGARM 1. Install: • Bushing "1" • Thrust bearing "2" •O i l s e a l " 3 " • Collar "4" To swingarm "5". Apply the molybdenum disulfide grease on the bushings, thrust bearings, oil seal lips and con- tact surfaces of the collar and thru st bearing.
5-52 SWINGARM 6. Install: • Swingarm "1" • Pivot shaft "2" • Apply the molybdenum disulfide grease on the pivot shaft. • Insert the pivot shaft from right side. 7. Check: • Swingarm side play "a" Free play exists → Replace thrust bearing.
5-53 SWINGARM 11.Tighten: • Nut (relay arm) "1" 12.Install: • Bolt (lower chain tensioner) "1" •W a s h e r " 2 " • Collar "3" • Lower chain tensioner "4" • Nut (lower chain tensioner) "5" 13.
5-54 REAR SHOCK ABSORBER REAR SHOCK ABSORBER REMOVING THE REAR SHOCK ABSORBER Order Part name Q 'ty Remarks Hold the machine by placing the suit- able stand under the en gine. Refer to "HANDLING NOTE". Seat Refer to "SE AT AND SIDE COV- ERS" section in the CHAPTER 4.
5-55 REAR SHOCK ABSORBER 9 Bearing 2 Refer to removal section. Order Part name Q 'ty Remarks.
5-56 REAR SHOCK ABSORBER HANDLING NOTE • Support the machine securely so there is no danger of it falling over. • This rear shock absorber is provided with a separate type tank filled with high-pres- sure nitrogen gas. To prevent the danger of explosion, read and understand the fol- lowing information before handling the shock absorber.
5-57 REAR SHOCK ABSORBER 3. Remove: • Lower bearing "1" Remove the bearing b y pressing its outer race. CHECKING THE REAR SHOCK ABSOR BER 1. Inspect: • Damper rod "1" Bends/damage → Replace rear shock ab- sorber assembly. • Shock absorber "2" Oil leaks → Replace rear shock absorber as- sembly.
5-58 REAR SHOCK ABSORBER 3. Install: • Lower bearing "1" Install the bearing by pressing it on the side having the manufacture's marks or numbers. INSTALLING THE SPRING (REAR SHOCK ABSORBER) 1. Install: • Spring "1" • Upper spring guide "2" • Lower spring guide "3" 2.
5-59 REAR SHOCK ABSORBER 2. Install: • Bushing "1" • Collar "2" • Dust seal "3" • Apply the molybdenum disulfide grease on the bearing and dust seal lips. • Install the dust seals with their lips facing in- ward.
6-1 FUEL SYSTEM This section is intended for those who have basic knowledge and skill concerning the se rvicing of Yamaha motorcycles (e.g., Yamaha dealers, service e ngineers, etc.
6-2 FUEL TANK FUEL TANK REMOVING THE FUEL TANK Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section in the chapter 4. Air scoop (left/right) 1/1 Refer to "SEAT AND SIDE COV- ERS" section in the chapter 4.
6-3 FUEL TANK REMOVING THE FUEL TANK 1. Extract the fuel in the fuel tank through the fuel tank cap with a pump. Be careful not to damage the fuel pump. 2. Remove: • Fuel pump coupler Although the fuel has been removed fro m the fuel tank be careful when re moving the fuel hoses, since there may be fuel remain- ing in it.
6-4 FUEL TANK CHECKING THE FUEL PUMP BODY 1. Check: • Fuel pump body Cracks/damage → Replace fuel pump as- sembly. CHECKING THE FUEL PUMP OPERATION 1. Check: • Fuel pump operation Refer to "CHECKING THE FUEL PRES- SURE" section. INSTALLING THE FUEL PUMP 1.
6-5 FUEL TANK 2. Install: • Fuel pump coupler • Air scoop (left/right) • Seat Refer to "SEAT AND SIDE COVERS" in the chapter 4. CHECKING THE FUEL PRESSURE 1. Check: • Pressure regulator operation 2. Remove the fuel tank. Refer to "REMOVEING THE FUEL TANK" section.
6-6 THROTTLE BODY THROTTLE BODY REMOVING THE THROTTLE BODY Order Part name Q 'ty Remarks Seat Refer to "SEAT AND SIDE COV- ERS" section in the chapter 4. Air scoop (left/right) Refer to "SEAT AND SIDE COV- ERS" section in the chapter 4.
6-7 THROTTLE BODY DISASSEMBLING THE THROTTLE BODY Order Part name Q 'ty Remarks 1 Injector 1 2G a s k e t 2.
6-8 THROTTLE BODY CHECKING THE INJECTOR Replace the fuel injector with a new one if you have dropped or impacted it. 1. Check: •I n j e c t o r s Damage → Re place. CHECKING THE THROTTLE BODY • Before removing the throttle body, clean the area around the throttle body to pre- vent dirt and other foreign material from falling into the engine.
6-9 THROTTLE BODY INSTALLING THE THROTTLE BODY 1. Install: • Throttle body joint "1" • Throttle body "2" • Face the slot "a" in the throttle body joint to- ward the bottom of the vehicle. • Align the slot “a” on the throttle body joint with the projection “b” on the throttle b ody.
7-1 ELECTRICAL COMPONENTS AND WIRING DIAGRAM ELECTRICAL This section is intended for those who have basic knowledge and skill concerning the se rvicing of Yamaha motorcycles (e.
7-2 ELECTRICAL COMPONENTS AND WIRING DIAGRAM WIRING DIAGRAM STOP ON Gy Gy B B / L W1 W2 W2 O R / B R R R R R R R Lg Lg Lg L P / W P Y B / R B B B B B BB B B / W B / W B / W Br / W Gy B / L W1 W1 W2 W2.
7-3 ELECTRICAL COMPONENTS AND WIRING DIAGRAM 1. Crankshaft position sensor 2. AC magneto 3. Rectifier/regulator 4. Condenser 5. Fuel pump 6. Engine stop switch 7. ECU 8. Ignition coil 9. Spark plug 10. Fuel injector 11. Intake air temperature sensor 12.
7-4 IGNITION SYSTEM IGNITION SYSTEM INSPECTION STEPS Use the following steps for che cking the possibility of the malfunctioning engine be ing attributable to ignition system failure and fo r checking the spark plug which will not spark. *marked: Only when the ignition checker is used.
7-5 IGNITION SYSTEM SPARK GAP TEST 1. Disconnect the spark plug cap from spark plug. 2. Connect the dynamic spark tester "1" (igni- tion checker "2") as shown. • Spark plug cap "3" • Spark plug "4" A. For USA and CDN B.
7-6 IGNITION SYSTEM CHECKING THE IGNITION COIL 1. Remove the ignition coil cap. 2. Inspect: • Primary coil resistance Out of specification → Replace. 3. Inspect: • Secondary coil resistance Out of specification → Replace. Disconnect the spark plug cap before measu r- ing the secondary coil resistance.
7-7 IGNITION SYSTEM CHECKING THE ECU 1. Check: • All electrical components. 2. Check: • ECU installation status Make sure that the ECU is installed correct- ly. • The lean angle sensor is built into the ECU. • The lean angle sensor stops the engine in case of a turnover.
7-8 THROTTLE POSITION SENSOR SYSTEM THROTTLE POSITION SENSOR SYSTEM INSPECTION STEPS If the throttle position sensor will not operate, use t he following inspection steps. *marked: Refer to "IGNITION SYSTEM" section. Use the following special too ls in this inspection.
7-9 THROTTLE POSITION SENSOR SYSTEM HANDLING NOTE Do not loosen the screw (throttle position sensor) "1" except when changing the throttle position sensor due to failure be- cause it will cause a drop in engine perfor- mance. CHECKING THE COUPLERS AND LEADS CONNECTION 1.
7-10 THROTTLE POSITION SENSOR SYSTEM 3. Replace: • Throttle position sensor 4. Install: • Throttle position sensor "1" • Screw (throttle position sensor) "2" • Align the projection "b" on the throttle body with the slot "a" in the throttle position sen sor.
7-11 FUEL INJECTION SYSTEM FUEL INJECTION SYSTEM TROUBLESHOOTING METHOD Engine starting problems, engine idling sp eed problems, and medium and high-speed perfor- mance problems 1. CHECK: • R efer to "TROUBLESHOOTING" sect ion in the chapter 3.
7-12 FUEL INJECTION SYSTEM CHECKING THE FAULT CODES 1. Set the switch on the FI diagnostic tool sub- wire harness to "ON". When the switch on the FI diagnostic tool sub- wire harness is set to "ON", make sure that "Waiting for connection" is displaye d on the LCD of the FI diagnostic tool.
7-13 FUEL INJECTION SYSTEM SENSOR OPERATION TABLE Diag- nostic code No. Item Actuation or display Checking method Actuation or LCD standard display values D01 Throttle angle Display Displays the throttle angle. 0–125° Check with throttle fully closed.
7-14 FUEL INJECTION SYSTEM D06 Coolant tempera- ture Display Displays the coolant t em- perature. • Check the coolant temper- ature. -20–150°C Cold engine: Displayed tem- perature is close to the ambi- ent temperature. Warm engine: Displayed temperature is the current coolant temperature.
7-15 FUEL INJECTION SYSTEM D61 Malfunction histo- ry code display. Display Displays the fault code num- bers that are stored in the malfunction history. If code numbers more than one are detected, the dis- play alternates every two seconds to show all the de- tected code numbers.
7-16 FUEL INJECTION SYSTEM TROUBLESHOOTING DETAILS This section describes t he countermeasures per fault code numbe r displayed on the FI diagnostic tool. Check and service the items or components that are the probable cause of the malfunction fol- lowing the order given.
7-17 FUEL INJECTION SYSTEM If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for fault code No. 13 first. 4 Installed condition of sensor. Check that the gap be tween the crank- shaft position sensor and the r otor is 0.
7-18 FUEL INJECTION SYSTEM Fault code No. 13 Symptom Intake air pressure sensor sig nal is not received properly. Fail-safe system Able to start Able to drive Diagnostic code No. D03 FI diagnostic tool dis- play Intake air pressure Checking method Crank the engine.
7-19 FUEL INJECTION SYSTEM If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for fault code No. 13 first. 4 Installed condition of sensor. Make sure that the installation position is correct. Check that the sensor is in- stalled securely an d that there are no pinched leads.
7-20 FUEL INJECTION SYSTEM Fault code No. 14 Symptom Intake air pressure sensor system malfunction detected. (clogge d hole or disconnected sensor) Fail-safe system Able to start Able to drive Diagnostic code No. D03 FI diagnostic tool dis- play Intake air pressure Checking method Crank the engine.
7-21 FUEL INJECTION SYSTEM Fault code No. 15 Symptom Throttle position sensor signal is not received properly. Fail-safe system Able to start Able to drive Diagnostic code No. D01 FI diagnostic tool dis- play • 15–19° (Fully closed position) • 95–101° (Fully opened position) Checking method • Check with throttle valves fully closed.
7-22 FUEL INJECTION SYSTEM 4 Installed condition of sensor. • Make sure that the installation posi- tion is correct. • Make sure that there are no problems with the installation. Check that the sensor is in- stalled securely an d that there are no pinched leads.
7-23 FUEL INJECTION SYSTEM Make sure that the engine is completely cool before checking the coolant temperature sensor. Fault code No. 16 Symptom Signal from throttle position sensor d oes not change. Fail-safe system Able to start Able to drive Diagnostic code No.
7-24 FUEL INJECTION SYSTEM Fault code No. 21 Symptom Coolant temperature sensor signal is not received properly. Fail-safe system Able to start Able to drive Diagnostic code No. D06 FI diagnostic tool dis- play -20–150°C Cold engine: Displayed temperature is close to t he ambient temperature.
7-25 FUEL INJECTION SYSTEM Make sure that the engine is complete ly cool before checking the intake air temperature sen- sor. 4 Installed condition of sensor. C heck that the sensor is in- stalled securely an d that there are no pinched leads.Check that the ECU is installed securely and that there are no pinched leads.
7-26 FUEL INJECTION SYSTEM Fault code No. 22 Symptom Intake air temperature sensor signal is n ot received properly. Fail-safe system Able to start Able to drive Diagnostic code No. D05 FI diagnostic tool dis- play -20 – 100°C Cold engine: Displayed temperature is close to t he ambient temperature.
7-27 FUEL INJECTION SYSTEM 4 Installed condition of sensor. C heck that the sensor is in- stalled securely an d that there are no pinched leads.Check that the ECU is installed securely and that there are no pinched leads. Incorrect installation → Re- install or repair.
7-28 FUEL INJECTION SYSTEM Fault code No. 23 Symptom Atmospheric pressure sens or signal is not received properly. Fail-safe system Able to start Able to drive Diagnostic code No. D02 FI diagnostic tool dis- play Atmosphere Checking method Measure the atmospheric pressure.
7-29 FUEL INJECTION SYSTEM 4 Installed condition of sensor. C heck that the sensor is in- stalled securely an d that there are no pinched leads.Check that the ECU is installed securely and that there are no pinched leads. Incorrect installation → Re- install or repair.
7-30 FUEL INJECTION SYSTEM Fault code No. 30 Symptom Turnover of vehicle Fail-safe system Able to start Unable to drive Diagnostic code No. D08 FI diagnostic tool dis- play Lean angle sensor • 1.0 V (Upright) • 4.0 V (Overturned) Checking method Remove the ECU and incline it 45° or more.
7-31 FUEL INJECTION SYSTEM Fault code No. 33 Symptom Ignition system circuit signal is not received properly. Fail-safe system Unable to start Unable to drive Diagnostic code No. D30 FI diagnostic tool dis- play Actuates the ignition coil for five times every second.
7-32 FUEL INJECTION SYSTEM 3 Continuity of harness Open or short circuit → Re- place. Between Ignition coil cou- pler and ECU coupler. (Orange–Orange) Start the engine and let it idle for approxi - mately 5 seconds. After completing the above operation, check whether a fault code number is dis- played.
7-33 FUEL INJECTION SYSTEM 5 Defective ignition coil. (test the primary coils for continuity) Defective → Replace. Refer to "CHECKING THE IGNITION COIL". Start the engine and let it idle for approxi - mately 5 seconds. After completing the above operation, check whether a fault code number is dis- played.
7-34 FUEL INJECTION SYSTEM Fault code No. 39 Symptom Injection system circuit signal is not received properly. Fail-safe system Unable to start Unable to drive Diagnostic code No. D36 FI diagnostic tool dis- play Actuates the injector for five times every second.
7-35 FUEL INJECTION SYSTEM 3 Check the connection and locking con- dition of the wire harness ECU coupler. Disconnect the coupler and check the pins. (bent or broken terminals and locking condition of the pins) Poor connecti on → Properly connect, repair, or replace.
7-36 FUEL INJECTION SYSTEM Fault code No. 41 Symptom Lean angle sensor malfunction. (the sensor is built into the ECU) Fail-safe system Unable to start Unable to drive Diagnostic code No. D08 FI diagnostic tool dis- play Lean angle sensor • 1.0 V (Upright) • 4.
7-37 FUEL INJECTION SYSTEM 2 EEPROM data error (CO adjustment value) Change the CO density and write the changed setting on EEPROM. Set the switch on the FI diagnostic tool sub- wire harness to "ON", and then check the fault code display. Fault code number is not displayed → Service is finished.
7-38 FUEL INJECTION SYSTEM Fault code No. 46 Symptom Power supply to the ECU is not normal. Fail-safe system Able to start (depending on circumstances) Able to drive vehicle (depending on circumstances) Diagnostic code No.
7-39 FUEL INJECTION SYSTEM 3 Malfunction of the rectifier/regulator. Defective → Replace. Refer to "CHECKING THE RECTIFIER/REGULATOR" section. Start the engine, set the switch on the FI di- agnostic tool sub-wire harness to "OFF" while the engine is idling, and let the en- gine continue to idle for 5 seconds or more.
7-40 FUEL INJECTION SYSTEM Fault code No. 50 Symptom ECU internal malfunction Fail-safe system Unable to start Unable to drive Diagnostic code No. — FI diagnostic tool dis- play — Checking method — Item Item/components and probable cause Check or maintenance job Checking method 1 Malfunction in ECU.
7-41 FUEL INJECTION SYSTEM 2 Check the connection and locking con- dition of the wire harness ECU coupler. Disconnect the coupler and check the pins. (bent or broken terminals and locking condition of the pins) Poor connecti on → Properly connect, repair, or replace.
7-42 FUEL INJECTION SYSTEM Fault code No. Er-4 Symptom Registered data cannot be received from the FI d iagnostic tool. Fail-safe system Able to start Able to drive Diagnostic code No.
7-43 FUEL INJECTION SYSTEM 4 FI diagnostic tool malfuncti on Replace the FI diagnostic tool. Set the switch on the FI diagnostic tool sub- wire harness to "ON", and then check the fault code display. Fault code number is not displayed → Service is finished.
7-44 FUEL PUMP SYSTEM FUEL PUMP SYSTEM INSPECTION STEPS If the fuel pump is not operating normally, perf orm the following procedures in the order given. • Remove the following parts before inspection. 1. Seat 2. Side cover (right/left) 3. Fuel tank • Use the following special tools in this inspection.
7-45 ELECTRICAL COMPONENTS ELECTRICAL COMPONENTS CHECKING THE COOLANT TEMPERATURE SENSOR 1. Remove: • Coolant temperature sensor Refer to "REMOVING THE CYLINDER HEAD" section in the CHAPTER 4. • Handle the coolant temperature sensor with special care.
7-46 ELECTRICAL COMPONENTS CHECKING THE INTAKE AIR TEMPERATURE SENSOR 1. Remove: • Intake air temperature sensor (from the air filter case.) • Handle the intake air temperature sensor with special care. • Never subject the intake air temperature sensor to strong shocks.
7-47 ELECTRICAL COMPONENTS CHECKING THE FUEL INJECTORS 1. Remove: • Seat • Fuel tank • Air filter case 2. Check: • Injector resistance 3. Connect: • Tester Tester (+) lead → Injector terminal "1" Tester (-) lead → Injector terminal "2" Out of specification → Replace.
8-1 CHASSIS TUNING CHASSIS SELECTION OF THE SECONDARY REDUCTION RATIO (SPROCKET) <Requirement for selection of secondary gear reduction ratio> • It is generally said that the secondary gear ra- tio should be reduced for a longer straight por- tion of a speed course and sh ould be increased for a course with many corners.
8-2 CHASSIS TIRE PRESSURE Tire pressure should be adjust to suit the road surface condition of th e circuit. • Under a rainy, muddy, sandy, or slippery con- dition, the tire pressure shou ld be lower for a larger area of contact with the road surface.
8-3 CHASSIS 2. Use of stiff spring • Change the rebound damping. Turn in one or two clicks. • Change the compression damping. Turn out one or two clicks. Generally a stiff spring give s a stiff riding feel- ing. Rebound damping tend s to become weak- er, resulting in lack of a sense of contact with the road surface or in a vibrating handlebar.
8-4 CHASSIS • If the machine is new and after it is broken in, the same set length of the spring may change because of the initial fatigue, etc. of the spring.
8-5 CHASSIS • Extent of adjustment (spring preload) For the spring preload adjustment, ref er to "AD- JUSTING THE REAR SHOCK ABSORBER SPRING PR ELOAD" in the CH APTER 3. Maximum Minimum Position in which the spring is turned in 18 mm (0.71 in) from its free length.
8-6 CHASSIS SUSPENSION SETTING (FRONT FORK) • If any of the following symptoms is experienced with the standard position as the base, make reset- ting by reference to the adjustment proce dure given in the same chart. • Before any change, set the rear shock absorber sunken len gth to the standard figure 90–100 mm (3.
8-7 CHASSIS SUSPENSION SETTING (REAR SHOCK ABSORBER) • If any of the following symptoms is experienced with the standard position as the base, make reset- ting by reference to the adjustment proce dure given in the same chart. • Adjust the rebound damping in 2-click increments or decre ments.
Q Read this manual carefull y before operating this vehicle. This manual should sta y with this vehicle if it is sold. 33D-9-10_cover 09.7.16 13:11 ページ 2.
PRINTED IN JAP AN 2010.05—0.8 × 1 ! (E) Y AMAHA MO T OR CO . , L TD . 2500 SHINGAI IW A T A SHIZUOKA JAP AN PRINTED ON RECYCLED P APER PROTECT YOUR INVESTMENT Use Genuine YAMAHA Parts And Accessori.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Yamaha YZ450FA è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Yamaha YZ450FA - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Yamaha YZ450FA imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Yamaha YZ450FA ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Yamaha YZ450FA, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Yamaha YZ450FA.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Yamaha YZ450FA. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Yamaha YZ450FA insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
