Gebruiksaanwijzing /service van het product WR450F (2008) van de fabrikant Yamaha
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5TJ-28199-45 WR450F OWNER’S SERVICE MANUAL MANUEL D’ATELIER DU PROPRIETAIRE FAHRER- UND WARTUNGSHANDBUCH MANUAL DE SERVICIO DEL PROPIETARIO PRINTED IN JAPAN 2007.10-1.6 × 1 CR (E,F,G,S) WR450F PRINTED ON RECYCLED PAPER Y AMAHA MO T OR CO . , L TD .
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WR450F 5TJ-28199-45-E0 2008 OW NER’S SERVICE MANUAL.
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WR450F OWNER'S SERVICE MANUAL ©2007 by Yamaha Motor Co., Ltd. 1st Edition, October 2007 All rights reserved. Any reprin ting or unauthorized use wi thout the written permission of Yamaha Motor Co.
FOREWORD INTRODUCTION Congratul ations on your pu rchase of a Yamaha WR series. This model is the culmination of Yamaha' s vast ex- perience in the production of paceset- ting racing machines. It represents the highest grade of craftsmanship and reliability that have made Yama- ha a leader.
TO THE NEW OWNER This manual will provide you with a good basic understanding of fea- tures, operation, and basic mainte- nance and inspection items of this machine. Please read this manual carefully and comple tely before oper- ating your new machine.
HOW TO READ DESCRIPTIONS To help identify parts and clarify pro- cedure steps, there are exploded dia - grams at the start of each removal and disassembly section. 1. An easy-to-see exploded diagram "1" is provided for removal and disassembly jobs.
TABLE OF CONTENTS GENERAL INFORMATION 1 SPECIFICATIONS 2 REGULAR INSPECTION AND ADJUSTMENTS 3 TUNING 4 ENGINE 5 CHASSIS 6 ELECTRICAL 7.
CONTENTS CHAPTER 1 GENERAL INFOR- MATION DESCRIPTION ................. 1-1 MACHINE IDENTIFICATION ............. 1-2 INCLUDED PARTS .......... 1-2 IMPORTANT INFORMATION................. 1-2 CHECKING OF CONNEC- TION ................................. 1-3 SPECIAL TOOLS .
1-1 DESCRIPTION GENERAL INFORMATION DESCRIPTION • The machine you have purchased may differ slightly from those shown in the following. • Designs and specifications are subject to chang e without notice. 1. Clutch lever 2. Hot starter lever 3. Engine stop switch 4.
1-2 MACHINE IDENTIFICATION MACHINE IDENTIFICATION There are two signifi cant reasons for knowing the serial number of your machine: 1. When ordering parts, you can give the number to your Yamaha dealer for positive identification of the model you own.
1-3 CHECKING OF CONNECTION ALL REPLACEMENT PARTS 1. We recommend to use Yamaha genuine parts for all replace- ments. Use oil and/or grease rec- ommended by Yamaha for assembly and adj ustment. GASKETS, OIL SEALS AND O- RINGS 1. All gaskets, oil seals, and O-rings should be replaced when an en- gine is overhauled.
1-4 SPECIAL TOOLS SPECIAL TOOLS The proper spe cial tools are necessary for complet e and accura te tune-up and asse mbly. Using the correct sp ecial tool will help prevent damage caused by the use of improper too ls or improvised techniques . The shape an d part number used fo r the special tool differ by coun try, so two types are provided.
1-5 SPECIAL TOOLS Damper rod holder YM-01494, 90890-01494 Use this tool to remove and install the damper rod. Fork seal driver YM-A0948, 90890-01502 This tool is used when install th e fork oil seal. Sheave holder YS-1880-A, 90890-01701 This tool is used for when loosening or tightening the flywheel magneto securing nut.
1-6 SPECIAL TOOLS Clutch holding tool YM-91042, 90890-04086 This tool is used to hold the clutch when removing or installing th e clutch boss securing nut. Valve guide remover Intake 4.5 mm (0.18 in) Exhaust 5.0 mm (0.20 in) YM-4116, 90890-04116 YM-4097, 90890-04097 This tool is needed to remove and install the valve gui de.
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1-8 CONTROL FUNCTIONS CONTROL FUNCTIONS MAIN SWITCH Functions of the respective switch po- sitions are as follows: ON: The engine can be started only at this position.
1-9 MULTI-FUNCTION DISPLAY COLD STARTER KNOB When cold, the engine requires a richer air-fuel mixture for starting. A separate starter circuit, which i s con- trolled by the cold starter knob "1", supplies this mixture. Pull the cold starter knob out to open the circuit for starting.
1-10 MULTI-FUNCTION DISPLAY To reset the digits, se lect the tripme- ter involved and push the "RST" but- ton for 2 seconds or more. CHANGEOVER TO BASIC MODE/ RACE MODE • Measurement using the time r func- tion can be made in RACE MODE. • Indicator will light up as an identifier that shows RACE MODE has been selected.
1-11 MULTI-FUNCTION DISPLAY If the machine is run while timer mea - surement is not made, n o change will occur to the digit in tripmeter A (TRIP A). 5. To resume the mea surement, again pushing the "SLCT1" button and "SLCT2" button at the same time.
1-12 MULTI-FUNCTION DISPLAY FUNCTION DIAGRAM A short push on the button changes the operation in the arrowed direction. A short push on the button changes the operation in both arrowed directions. A long push on the button changes the operation in the arrowed direction.
1-13 MULTI-FUNCTION DISPLAY The following diagram illustrates th e multi-function display rega rding the direction and operation condition in- volved in each of its functions. A. A short push on the button changes the operation i n the ar- rowed direction.
1-14 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 gaso line. The use of leaded g asoline will cause severe damage to the engi ne inter- nal parts such as valv es, piston rings, and exhaust system, etc.
1-15 STARTING AND BREAK-IN The engine fails to start Pull the hot starter lever all the way out and while holding the lever, kick the kickstarter crank 10 to 20 times to clear the engine. Then, re start the en- gine. Refer to "Restarting an engine after a fall".
1-16 TORQUE-CHECK POINTS TORQUE-CHECK POINTS Concerning the tightening torque, refer to "TIGHTENING TORQUES" section in the CHAPTER 2. Frame construction Frame to rear frame Combined seat an.
1-17 CLEANING AND STORAGE CLEANING AND STORAGE CLEANING Frequent cleaning of your machine will enhance its appe arance, maintain good overall perfo rmance, and ex- tend the life of many components. 1. Before washing the machine, block off the en d of the exhaust pipe to prevent water from enter- ing.
2-1 GENERAL SPECIFICATIONS SPECIFICATIONS GENERAL SPECIFICATIONS Model name: WR450FX (CDN, AUS, NZ) WR450F (EUROPE, ZA) Model code numbe r: 5TJK (CDN) 5TJL (EUROPE) 5TJM (AUS, NZ, ZA) Dimensions: CDN, ZA AUS, NZ EUROPE Overall length 2,175 mm (85.63 in) 2,190 mm (86.
2-2 GENERAL SPECIFICATIONS (Except for CDN) SAE10W30, SAE10W40, SAE15W40, SAE20W40 or SAE20W50 API service SG type or higher, JASO standard MA Oil capacity: Engine oil Periodic oil change 0.95 L (0.84 Imp qt, 1.00 US qt) With oil filter replacement 1.
2-3 GENERAL SPECIFICATIONS Chassis: CDN, ZA AUS, NZ EUROPE Frame type Semi double cra- dle ←← Caster angle 27.3 ° 27.0 ° 26.8 ° Trail 117 mm (4.
2-4 MAINTENANCE SPECIFICATIONS MAINTENANCE S PECIFICATIONS ENGINE Item Standard Limit Cylinder head: Warp limit ---- 0.05 mm (0.002 in) Cylinder: Bore size 95.00–95.01 mm (3.7402 –3.7406 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 Valve, valve seat, valve guide: Valve clearance (cold) IN 0.10–0.15 mm (0.0039–0.0059 in ) ---- EX 0.20–0.25 mm (0.0079–0.0098 in ) ---- Valve dimensions: "A" head diameter (IN) 26.9–27.1 mm (1.0591–1.
2-6 MAINTENANCE SPECIFICATIONS Stem runout limit ---- 0.01 mm (0.0004 in) Valve spring: Free length (IN) 39.46 mm (1.55 in) 38.46 mm (1.51 in) Free length (EX) 37.61 mm (1.48 in) 36.61 mm (1.44 in) Set length ( valve closed ) (IN) 27.87 mm (1.10 in) ---- Set length ( valve closed ) (EX) 28.
2-7 MAINTENANCE SPECIFICATIONS Piston rings: Top ring: Type Barrel ---- Dimensions (B × T) 1.2 × 3.5 mm (0.05 × 0.14 in) ---- End gap (installed) 0.20–0.30 mm (0 .008–0.012 in) 0.55 mm (0.022 in) Side clearance (insta lled) 0.030–0.065 mm (0.
2-8 MAINTENANCE SPECIFICATIONS Clutch: Friction plate thickness 2.92–3.08 mm (0.115–0.121 in) 2.8 mm (0.110 in) Quantity 8 ---- Clutch plate 1 thickness 1.9–2.1 mm (0.075–0.083 in ) ---- Quantity 4 ---- Warp limit ---- 0.1 mm (0.004 in) Clutch plate 2 thickness 1.
2-9 MAINTENANCE SPECIFICATIONS 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 (0.009 in) Housing and rotor clearance 0.
2-10 MAINTENANCE SPECIFICATIONS CHASSIS Item Sta ndard Limit Steering system: Steering bearing type Taper roller bearing ---- Front suspension: CDN AUS, NZ, ZA, EUROPE Front fork travel 300 mm (11.8 in) ← ---- Fork spring free length 460 mm (18.1 in) ← 455 mm (17.
2-11 MAINTENANCE SPECIFICATIONS ELECTRICAL Drive chain: Type/manufacturer DID520VM/DAIDO ---- Number of links 113 links + joint ---- Chain slack 48–58 mm (1.9–2.3 in) ---- Chain length (15 links) ---- 239.3 mm (9.42 in) Front disc brake: Disc outside dia.
2-12 MAINTENANCE SPECIFICATIONS Charging system: System type AC magneto ---- Model (stator)/manufacture r 5TJ 50/YAMAHA ---- Normal output 14 V/120 W at 5,000 r/min ---- Charging coil resistance (color) 0.28 8–0.432 Ω at 20 °C (68 °F) (White– Ground) ---- Lighting coil resistance (color) 0.
2-13 TIGHTENING TORQUES TIGHTENING TORQUES ENGINE △ - marked portion shall be checked for torque ti ghtening after brea k-in or before each race. *1: Tighten the cylinder head bo lts to 30 Nm (3.0 m•kg, 22 ft•l b) in the prop er tightening sequence, remove and retighten the cylinder head bolts to 20 Nm (2.
2-14 TIGHTENING TORQUES Radiator pipe 1, 2 M10 × 1.0 2 10 1.0 7.2 Impeller M8 × 1.25 1 14 1.4 10 Water pump housing cover M6 × 1.0 3 10 1.0 7.2 Coolant drain bol t M6 × 1.0 1 10 1.0 7.2 Oil pump cove r M4 × 0.7 1 2 0.2 1.4 Oil pump M6 × 1.0 2 10 1.
2-15 TIGHTENING TORQUES CHASSIS △ - marked portion shall be checked for torque ti ghtening after brea k-in or before each race. Part to be tightened Thread size Q'ty Tightening torque Nm m•kg ft•lb △ Upper bracket and outer tube M8 × 1.25 4 21 2.
2-16 TIGHTENING TORQUES △ Driven sprocket and wheel hub M8 × 1.25 6 50 5.0 36 △ Nipple (spoke) — 72 3 0.3 2.2 △ Disc cover and rear brake caliper M6 × 1.0 2 10 1.0 7.2 △ Protector and rear brake calip er M6 × 1.0 2 7 0.7 5.1 Chain puller adjust bolt and locknut M8 × 1.
2-17 TIGHTENING TORQUES 1. First, tighten the steering ring nut app roximately 38 Nm (3.8 m•kg, 27 ft•l b) by using the steerin g nut wrench, then loosen the steering ring nut one turn. 2. Retighten the steering ring nut 7 Nm (0.7 m•kg, 5.1 ft•lb).
2-18 TIGHTENING TORQUES GENERAL TORQUE SPECIFICA TIONS This chart specifies torque for stan- dard fasteners with standard I.S.O. pitch threads. Torque specifications for special components or assem- blies are included in the applicable sections of this book.
2-19 LUBRICATION DIAGRAMS LUBRICATION DIAGRAMS 1. Oil filter element 2. Oil pump 3. Drive axle 4. Main axle 5. Crankshaft 6. Connecting rod A. From cylinder B.
2-20 LUBRICATION DIAGRAMS 1. Intake camshaft 2. Exhaust camshaft A. To main axle B. From oil pump.
2-21 CABLE ROUTING DIAGRAM CABLE ROUTING DIAGRAM 1. Fuel tank breather hose 2. Clamp 3. Diode 4. Hot starter cable 5. Throttle position sensor lead 6. Wire harness 7. Hump (frame) 8. Negative battery lead 9. Starter motor lead 10. Neutral switch le ad 11.
2-22 CABLE ROUTING DIAGRAM C. Fasten the diode (at the mark- ing), throttle cable and hot start- er cable onto the frame. Locate the clamp end facing towa rd the lower right of the frame and with the tie end facing downward . D. Fasten the wire harness, throttle position sensor lead and clutch cable onto the frame.
2-23 CABLE ROUTING DIAGRAM 1. Throttle cable (pull) 2. Throttle cable (return) 3. Catch tank hose 4. Ignition coil 5. Clamp 6. Air induction hose (air cut-off valve - rear of cylinder he ad) 7. Catch tank breather hose A. Cross the pull and push throttle cables.
2-24 CABLE ROUTING DIAGRAM 1. Brake ma ster cylinder 2. Brake hose holder 3. Brake ho se A. Install the brake hose so that its pipe portion directs as shown and lightly touches the projec- tion on the brake caliper. B. Pass the brake hose into the brake hose holders.
2-25 CABLE ROUTING DIAGRAM 1. Clamp 2. Positive battery lead 3. Battery 4. Negative battery lead 5. Taillight coupler 6. CDI unit coupler (6-pin) 7. CDI unit coupler (3-pin) 8. CDI unit coupler (6-pin) A. Fasten the wire harness to th e upper engine bracket (left side).
2-26 CABLE ROUTING DIAGRAM E. Connect the wire harness to the starter relay. F. Fasten the catch tank breather hose and catch tank hose to the rear frame. Clamp them close to where they are joined to the frame. Fasten the pipe tightly enough not to crush it.
2-27 CABLE ROUTING DIAGRAM 1. Throttle cable 2. Clamp 3. Brake ho se 4. Clutch cable 5. Hose guide 6. Main switch coupler 7. Wire harness 8. Headlight coupler 9. Hot starter cable 10. Multi-function displ ay bracket 11. Main switch 12. Upper bracket 13.
2-28 CABLE ROUTING DIAGRAM D. Secure the coupl er by inserting it into the multi-function display bracket. E. Pass the throttle cables, clutch cable and hot starter cable be- tween the upper bracket and multi-function displ ay bracket. F. Fasten the multi-function display leads to the bracket.
3-1 MAINTENANCE INTERVALS REGULAR INSPECTION AND ADJUSTMENTS MAINTENANCE IN TERVALS The following schedule is intended as a gen eral guide to maint enance and l ubrication. Bear in mind that such factors as weather, terrain, geographical location, and individual u sage will alter the requ ired maintenance and lubrication intervals.
3-2 MAINTENANCE INTERVALS CLUTCH Inspect and adjust ●● Insp ect housing, friction plate, clutch plate and spring. Replace ● TRANSMISSION Inspect ● Replace bearing ● SHIFT FORK, SHIFT CAM, GUIDE BAR Inspect ● Inspect wear.
3-3 MAINTENANCE INTERVALS FUEL TANK, COCK Clean and insp ect ●● BRAKES Adjust lever position a nd pedal height ●● Lubricate pivot point ●● Check brake disc surface ●● Check fluid level.
3-4 MAINTENANCE INTERVALS TIRE, WHEELS Inspect air pressure , wheel run- out, tire wear and spoke loose- ness ●● Retighten sprocke t bolt ●● Inspect bearings ● Replace bearings ● Lubricate.
3-5 PRE-OPERATION INSPECTION AND MAINTENANCE PRE-OPERATION INSPECTION AND MAINTENANCE Before riding for break-in operation or practice, make sure the machine is in goo d operating condition.
3-6 ENGINE ENGINE REMOVING THE SEAT, FUEL TANK AND SIDE COVERS Order Part name Q'ty Remarks Turn the fuel cock to "OFF". Disconnect the fuel hose. 1S e a t 1 2 Air scoop (left and right) 2 3 Bolt (fuel tank) 2 4 Fuel tank 1 5 Left side cover 1 Open the air filter case cover.
3-7 ENGINE REMOVING THE SIDE COVER 1. Remove: • Bolt (side cover) • Right side cover "1" Draw the side cover backward to re- move it because its claw "a" is insert- ed in the air filter case.
3-8 ENGINE REMOVING THE EXHAUST PIPE AND SILENCER Order Part name Q'ty Remarks Right side cover Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section.
3-9 ENGINE CHECKING THE SILENCER AND EXHAUST PIPE 1. Inspect: • Gasket "1" Damage → Replace. INSTALLING THE SILENCER AND EXHAUST PIPE 1. Install: • Gasket • Exhaust pipe "1".
3-10 ENGINE Handling note s of coolant: The coolant is harmful so it should be handled with sp ecial care. • When cool ant splashes to your eye. Thoroughly wash your eye wi th water and see your do ctor. • When cool ant splashes to your clothes. Quickly wash it away with water and then with soap.
3-11 ENGINE 2. Adjust: • Throttl e grip free play Throttle grip free play adjus tment steps: a. Slide the adjuster cover. b. Loosen the locknut "1". c. Tu rn the adjuster "2" until the specified free play is obtained. d. Tighten the lockn ut.
3-12 ENGINE 5. Inspect: • Air filter element Damage → Replace. 6. Apply: • Foam-air-filter oil or equivalent oil to the el ement • Squeeze out the e xcess oil. Ele- ment shoul d be wet but not drip- ping. • Wipe off the oil left on the element surface using a clean dry cloth.
3-13 ENGINE • Do not add any chemical add i- tives or use oils with a grade of CD "a" or higher. • Do not use oi ls labeled "ENERGY CONSERVING II" "b" or higher. Engine oil also lubricates the clutch and additives could cause clutch slippage.
3-14 ENGINE ADJUSTING THE PILOT SCREW 1. Adjust: • Pilot screw "1" Adjustme nt steps: To optimize the fuel flo w at a smaller throttle opening, e ach machine's pilot screw has been individuall y set at the factory. Before adju sting the pilo t screw, turn it in fully and count the number of turns.
3-15 ENGINE 5. Adjust: • Valve clearance Adjustme nt steps: a. Remove the camshaft (intake and exhaust). Refer to "CAMSHAFTS" section in the CHAPTER 5. b. Remove the valve lifters "1" and the pads "2". • Place a rag in the timing chain space to prevent pads from falling into the crankcase.
3-16 ENGINE INTAKE EXHAUST.
3-17 CHASSIS CLEANING THE SPARK ARRESTER (For USA) • Be sure the exhaust pipe and si- lencer a re cool before cleaning the spark arre ster. • Do not sta rt the engine whe n cleaning the exhaus t system. 1. Remove: • Screw (silencer ca p) "1" 2.
3-18 CHASSIS 2. Remove: • Brake lever cover 3. Adjust: • Brake lever position Brake lever position adjustment steps: a. Loosen the locknut "1". b. Turn the adjusti ng bolt "2" until the lever position "a" is within speci- fied position.
3-19 CHASSIS i. Insta ll the brake caliper "8" and tighten the pad pin "9". j. Insta ll the pad pin plug "10". 3. Inspect: • Brake fluid level Refer to "CHECKING THE BRAKE FLUID LEVEL" section. 4. Check: • Brake lever operation A softy or spongy feeling → Bleed brake system.
3-20 CHASSIS 3. Inspect: • Brake fluid level Refer to "CHECKING THE BRAKE FLUID LEVEL" section. 4. Check: • Brake pedal operation A softy or spongy feeling → Bleed brake system. Refer to "BLEEDING THE HY- DRAULIC BRAKE SYSTEM" sec- tion.
3-21 CHASSIS When installing th e drive chain, apply the lithium soap base grease on th e chain joint and O-rings. 7. Install: • Link plate • Press the link plate onto the chain joint using a drive chain riveter "5". • Rivet the end of the chain joint us- ing a drive chai n riveter.
3-22 CHASSIS 1. Elevate the front wheel by placing a suitable stand under the engine. 2. Remove the air bleed screw "1" and release the internal pressure from the front fork. 3. Install: • Air bleed screw ADJUSTING THE FRONT FORK REBOUND DAMPING FORCE 1.
3-23 CHASSIS Never attempt to turn the adjuster beyond the maximum or minimum setting. 5. Tighten: •L o c k n u t 6. Install: • Rear frame (upper) • Rear frame (lower) ADJUSTING THE REAR SHOCK ABSORBER REBOUND DAMPING FORCE 1. Adjust: • Rebound dampin g force By turning the adjuster "1".
3-24 CHASSIS CHECKING THE TIRE PRESSURE 1. Measure: • Tire pressure Out of specification → Adjust. • Check the tire while it is cold. • Loose bead stoppers a llow the tire to slip off its position on t he rim when the tire pressure is low. • A tilted tire valve stem indicates that the tire slips off its position on the rim.
3-25 CHASSIS • The handlebar upper holder should be installed with the punched mark "a" forward. • Install the handleb ar so that the marks "b" are in place on both sides. • Install the han dlebar so that the pro- jection "c" of the handlebar upper holder is positioned at the mark on the handlebar a s shown.
3-26 CHASSIS LUBRI CATION To ensure smooth operation of all components, lubricate your machine during setup, afte r 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 contact 6.
3-27 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 light tan color. Distinctly different color → Check the engine condition.
3-28 ELECTRICAL 3. Remove: • Battery band •B a t t e r y 4. Measure: • Battery charge Measurement steps: a. Connect a pocket tester "1" to the battery terminals. • The charge state of an MF battery can be checked by measuring its open-circuit voltage (i.
3-29 ELECTRICAL Charging method using a variabl e voltage charger.
3-30 ELECTRICAL Charging method usin g a constant voltage charger.
3-31 ELECTRICAL 6. Install: •B a t t e r y • Battery band 7. Connect: • Battery leads (to the batte ry terminals) First, connect the positiv e lead "1", then the negative lead "2". 8. Check: • Battery terminals Dirt → Clean with a wire brush.
3-32 ELECTRICAL ADJUSTING THE HEADLIGHT BEAMS 1. Adjust: • Headlight beam (ve rtically) Adjusting steps: a. Turn the adjustin g screw "1" in di- rection "a" or "b". Direction "a" Headlight beam is raised. Direction "b" Headlight beam is lowered.
4-1 ENGINE TUNING ENGINE CARBURETOR SETTING • The air/fuel mixture will vary de- pending on atmospheric conditi ons. Therefore, it is necessary to take into consideration the air pressure, ambient temperature, hu midity, etc., when adjusting the carburetor.
4-2 ENGINE ADJUSTING THE PILOT JET The richness of the air-fuel mixtu re with the throttle open 1/4 or less can be set by adjusti ng the pilot jet "1".
4-3 ENGINE CARBURETOR SETTING PARTS Main jet Size Part number (-14943-) Rich #185 4MX-44 #182 4MX-94 #180 4MX-43 #178 4MX-93 #175 4MX-42 #172 4MX-92 #170 4MX-41 #168 4MX-91 #165 4MX-40 (STD) #162 4MX-.
4-4 ENGINE EXAMPLES OF CARBURETOR SETTING DEPENDING ON SYMPTOM * This should be taken simply for an example. It is necessary to set the carbureto r while checking the operating conditions of the engine. Symptom Setting Checking At full throttle Hard breathing Shearing noise Whitish spark plug ↓ Lean mixture Increase main jet cal ibration no.
4-5 CHASSIS CHASSIS SELECTION OF THE SECONDARY REDUCTION RATIO (SPROCKET) <Requirement for selection of sec- ondary gear reduction ra tio> • It is generally said that the second- ary gear ratio should be reduced for a longer straight portion of a speed course and should be in creased for a course with many corners.
4-6 CHASSIS A. Air spring characteristics in relation to oil l evel change B. Load C. Stroke 1. Max. oil level 2. Standard oil level 3. Min. oil level ADJUSTING THE SPRING PRELOAD The spring preload is adjusted by in- stalling the adjustment washer "1 " be- tween the fork spring "2" and damper rod "3".
4-7 CHASSIS 2. Setting of damping force • Change the rebound damping. • Change the compression damp- ing. CHOOSING SET LENGTH 1. Place a stand or bl ock under the engine to put the rear wheel above the floor, and measure the length "a" between the rear wheel axle center and the re ar fender holding bolt.
4-8 CHASSIS SUSPENSION SETTING (FRONT FORK) • If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure gi ven in the same chart. • Before any change, set t he rear shock absorber sunken length to the standard figure 90–100 mm (3.
4-9 CHASSIS SUSPENSION SETTING (REAR SHOCK ABSORBER) • If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure gi ven in the same chart. • Adjust the rebound damping in 2-click increments or decrements.
5-1 RADIATOR ENGINE RADIATOR REMOVING THE RADIATOR Order Part name Q'ty Remarks Drain the coolant. Refer to "CHANGING THE COOLANT" sec - tion in the CHAPTER 3. Seat, fuel tank and left side cover Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section in the CHAPTER 3.
5-2 RADIATOR 11 Pipe 1/O-ring 1/1 12 Catch tank breather hose 1 13 Catch tank 1 Order Part name Q'ty Remarks.
5-3 RADIATOR HANDLING NOTE Do not remove the radiator cap when the engine and ra diator are hot. Scaldi ng hot fluid and ste am may be blown out under pressure, which could ca use serious in jury.
5-4 CARBURETOR CARBURETOR REMOVING THE CARBURETOR Order Part name Q'ty Remarks Seat and fuel ta nk Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section in the CHAPTER 3. Rear shock absorber Refer to "REAR SHOCK ABSORBER" sec- tion in the CHAPTER 6.
5-5 CARBURETOR 13 Bracket (cylinder head breather pipe) 1 14 Carburetor joint 1 Order Part name Q'ty Remarks.
5-6 CARBURETOR DISASSEMBLING THE CARBURETOR Order Part name Q'ty Remarks 1 Carburetor breather hose 4 2 Valve lever housing cover 1 3 Screw (throttle shaft) 1 4 Throttle valve 1 5 Need le holder .
5-7 CARBURETOR 19 Main jet 1 20 Needle jet 1 21 Spacer 1 22 Pilot jet 1 23 Starter jet 1 24 Push rod 1 Pull the push rod. 25 Throttle shaft assembly 1 26 Push rod link lever assembly 1 27 Pilot air je.
5-8 CARBURETOR HANDLING NOTE Do not loosen th e screw (throttle position sensor) "1" except when changing the th rottle position sen- sor due to failur e because it will cause a drop in engine pe rfor- mance.
5-9 CARBURETOR e. If both are fine, adjust the float height by bending th e float tab "b" on the float. f. Recheck the float height. CHECKING THE FLOAT 1.
5-10 CARBURETOR • Apply the fluoro chemical grease on the bearings. • Fit the projection "a" on the throttle shaft assembly into the slot "b" in the throttle posit ion sensor. • Make sure the stopper "c" of the spring fits into the recess in the car- buretor .
5-11 CARBURETOR 17. Install: • Throttle valve assembly "1" • Screw (throt tle shaft) "2" Install the valve lever rollers "3" into the slits "a" of the throttle valve. 18. Install: • O-ring "1" • Valve lever housing cover "2" • Bolt (valve lever housing cov er) "3" 19.
5-12 CARBURETOR 7. Install: • Throttle cable cover "1" • Bolt (thr ottle cable cover) "2" 8. Install: • Throttle po sition sensor lead cou- pler "1" • Clamp "2 " Refer to "CABLE R OUTING DIA- GRAM" section in the CHAPTER 2.
5-13 AIR INDICTOIN SYSTEM AIR INDICTOIN SYSTEM REMOVING THE AIR INDUCTION SYSTEM Order Part name Q'ty Remarks 1 Bracket 1 2 Air cut-off valve assembly 1 3 Air induction hose (ai r cut-off valve -.
5-14 AIR INDICTOIN SYSTEM CHECKING THE AIR INDUCTION SYSTEM 1. Inspect: • Air induction hose Crack/damage → Replace. • Air induction pipe Crack/damage → Replace. 2. Check: • Operation of air cut valve Pass air through the pipe and check the air cut valve for opera- tion.
5-15 CAMSHAFTS CAMSHAFTS REMOVING THE CYLINDER HEAD COVER Order Part name Q'ty Remarks Seat and fuel ta nk Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section in the CHAPTER 3. Air cut-off valve assembly Refer to "AIR INDUCTION SYSTEM" section.
5-16 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.
5-17 CAMSHAFTS REMOVING THE CAMSHAFT 1. Remove: • Timing mark accessing screw "1" • Crankshaft end accessing screw "2" 2. Align: • T.D.C. mark With align mark. Checking steps: a. Turn the crankshaft counterclock- wise with a wren ch.
.
5-19 CAMSHAFTS Do not turn the cranksha ft during the camshaft insta llation. Damage or improper valve timing will re- sult. d. Install the clips, camshaft caps "4" and bolts (camshaft cap) "5". • Before removing the clip s, cover the cylinder head with a clean rag to prevent the clips from into the cylin- der head cavity.
5-20 CYLINDER HEAD CYLINDER HEAD REMOVING THE CYLINDER HEAD Tighten the cylinder head bolts to 30 Nm (3.0 m•kg, 22 ft•lb ) in the proper ti ghtening sequenc e, remove and retighten the cylinder head bolts to 20 Nm (2.
5-21 CYLINDER HEAD CHECKING THE CYLINDER HEAD 1. Eliminate: • Carbon deposits (from the com- bustion chambers) Use a rounded scraper. Do not use a sharp instrument to avoid damaging or scratching: • Spark plug threads • Valve seats 2. Inspect: • Cylinder head Scratches/damage → Replace.
5-22 CYLINDER HEAD 3. Install: • Bolt (cylinder head) "1" Bolt (cylinder head): 10 Nm (1.0 m•kg, 7.2 ft•lb).
5-23 VALVES AND VALVE SPRINGS VALVES AND VALVE SPRINGS REMOVING THE VALVES AND VALVE SPRINGS Order Part name Q'ty Remarks Cylinder head Refer to "CYLINDER HEAD" section. 1 Valve lifter 5 Refer to removal sectio n. 2 Adjusting pad 5 Refer to removal section.
5-24 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" po- sition very carefully so that they can be reinstalled in their original pla ce.
5-25 VALVES AND VALVE SPRINGS 4. Measure: • Margin thickness "a" Out of specification → Replace. 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 replace the oil seal.
5-26 VALVES AND VALVE SPRINGS CHECKING THE VALVE SPRINGS 1. Measure: • Valve spring free length "a" Out of specification → Replace. 2. Measure: • Compressed spring force "a" Out of specification → Replace. b. Installed length 3.
5-27 CYLINDER AND PISTON CYLINDER AND PISTON REMOVING THE CYLINDER AND PISTON Order Part name Q'ty Remarks Cylinder head Refer to "CYL INDER HEAD" section. 1 Bolt (cylinder) 1 2 Cylinder 1 3 Gasket 1 4 Dowel pin 2 5 Piston pin clip 2 Refer to removal section.
5-28 CYLINDER AND PISTON REMOVING THE PISTON AND PISTON RING 1. Remove: • Piston pin clip "1" • Piston pin "2" • Piston "3" • Put identification marks on each piston head for reference during re- installation. • Before removing each piston pin, deburr the clip groove and pin hole area.
5-29 CYLINDER AND PISTON 3. Measure: • Ring end gap Out of specification → Replace. You cannot measure the end gap on the expander spacer of the oil control ring. If the oil control ring rails show excessive gap, replace all three rings. CHECKING THE PISTON PIN 1.
5-30 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" section. Clutch cable Disconnect at engine side.
5-31 CLUTCH 14 Nut (clutch boss) 1 Refer to removal section. 15 Lock washer 1 Refer to removal sectio n. 16 Clutch boss 1 Refer to removal section. 17 Thrust washer 1 18 Primary driven gear 1 19 Push .
5-32 CLUTCH REMOVING THE CLUTCH BOSS 1. Remove: •N u t " 1 " • Lock washer "2" • Clutch boss "3" Straighten the lock washer tab and use the clutch holding tool "4" to hold the clutch boss. A. For USA and CDN B.
5-33 CLUTCH 2. Install: • Lock washer "1" • Nut (clutch boss) "2" Make sure to tighten to specifica- tion; otherw ise, it may damage the other part that is fastened togeth- er. • Install the lock washer with its con- caves fitted over the convexes of the clutch boss.
5-34 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" section. Drain the engine oil . Refer to "CHANGING THE ENGINE OIL" section in the CHAPTER 3.
5-35 OIL FILTER ELEMENT AND WATER PUMP 9 Gasket 1 10 Dowel pin/O-ring 3/1 11 Impeller 1 Refer to removal section. 12 Washer 1 Refer to removal section. 13 Impeller shaft 1 Refer to removal section. 14 Oil seal 1 1 Refer to removal sectio n. 15 Oil seal 2 1 Refer to removal sectio n.
5-36 OIL FILTER ELEMENT AND WATER PUMP REMOVING THE IMPELLER SHAFT 1. Remove: • Impeller "1" • Washer "2" • Impeller shaft "3" Hold the impeller shaft on its width across the flats "a" with spanners, etc. and remove the impeller.
5-37 OIL FILTER ELEMENT AND WATER PUMP 2. Install: • Right crankcase cover "1" •B o l t " 2 " •B o l t • Apply the engine oil on the impeller shaft end. • When installing the crankcase cov- er onto the crankca se, be sure that the impeller shaft end "2" aligns with the balancer end slot "3".
5-38 BALANCER BALANCER REMOVING THE BALANCER Order Part name Q'ty Remarks Primary driven gear Refer to "CLUTCH" secti on. Right crankcase cover Refer to "OIL FILTER ELEMENT AND WA- TER PUMP" section. Stator Refer to "CDI MAGNETO" section.
5-39 BALANCER REMOVING THE BALANCER 1. Straighten the lock wa sher tab. 2. Loosen: • Nut (balancer) "1" • Nut (primary drive gear) "2" • Nut (balancer shaft driven gear) "3" Place an aluminum plate "a" b etween the teeth of the balancer shaft drive gear "4" and driven gear "5".
5-40 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 WA- TER PUMP" section.
5-41 OIL PUMP 15 Oil pump drive shaft 1 16 Rotor housing 1 Order Part name Q'ty Remarks.
5-42 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.
5-43 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.
5-44 KICK SHAFT AND SHIFT SHAFT 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.
5-45 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.
5-46 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 p awl.
5-47 KICK SHAFT AND SHIFT SHAFT INSTALLING THE KICK IDLE GEAR 1. Install: • Kick idle gear "1" • Washer "2" • Circlip "3" • Apply the e ngine oil on the kick idle gear inner circumference. • Install the kick idle gear with its de- pressed side "a " toward you.
5-48 AC MAGNETO AND STARTER CLUTCH AC MAGNETO AND STARTER CLUTCH REMOVING THE AC MAGNETO AND STARTER CLUTCH Order Part name Q'ty Remarks Drain the engine oil . Refer to "CHANGING THE ENGINE OIL" section in the CHAPTER 3. Seat and fuel ta nk Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section in the CHAPTER 3.
5-49 AC MAGNETO AND STARTER CLUTCH Tighten the rotor nut to 65 Nm (6.5 m•kg, 47 ft•lb), loosen and retighten th e rotor nut to 65 Nm (6.5 m•kg, 47 ft•lb). 12 Woodruff key 1 13 Starter clutch assembly co ver 1 Refer to removal section. 14 Starter clutch 1 Refer to removal section.
5-50 AC MAGNETO AND STARTER CLUTCH REMOVING THE ROTOR 1. Remove: • Nut (rot or) "1" • Washer Use the sheave holder "2". 2. Remove: • Rotor "1" Use the rotor puller "2".
5-51 AC MAGNETO AND STARTER CLUTCH • Pass the AC magneto lead "5" un- der the pickup coil. • Pass the AC magneto lead "4" un- der the holder as shown. • Take care not to catch the AC mag- neto lead between crankcase cover ribs.
5-52 AC MAGNETO AND STARTER CLUTCH Install the co ver (idle gear 1) wi th its mark "a" facing upw ard. 11. Connect: • AC magneto lead Refer to "CABLE R OUTING DIA- GRAM" section in the CHAPTER 2.
5-53 ENGINE REMOVAL ENGINE REMOVAL REMOVING THE ENGINE Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the frame. Refer to "HANDLING NOTE". Drain the engine oil . Refer to "CHANGING THE ENGINE OIL" section in the CHAPTER 3.
5-54 ENGINE REMOVAL Ignition coil Disconnect the AC magneto lead. Disconnect the starter motor lead. Refer to "ELECTRIC STARTING SYSTEM" section in the CHAPTER 7. Negative battery lead Disconnect at the engine side. 1 Engine guard 1 2 Neutr al switch 1 3 Drive chain sprocket cover 1 4 Nut (drive sprocket) 1 Ref er to removal section.
5-55 ENGINE REMOVAL HANDLING NOTE Support the machine securely so there is no dange r 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 applyi ng the rear brake.
5-56 ENGINE REMOVAL 2. Install: • Lock washer "1" • Nut (drive sprocket) "2" Tighten the nut while applying the rear brake. Make sure to tighten to specifica- tion; otherw ise, it may damage the other part that is fastened togeth- er.
5-57 CRANKCASE AND CRANKSHAFT CRANKCASE AND CRANKSHAFT REMOVING THE CRANKSHAFT Order Part name Q'ty Remarks Engine Refer to "ENGINE REMOVAL" section. Piston Refer to "CYLINDE R AND PISTON" section. Balancer Refer to "BALANCER" section.
5-58 CRANKCASE AND CRANKSHAFT 9 Left crankcase 1 Refer to removal section. 10 Oil strainer 1 11 Balancer shaft 1 Refer to removal section. 12 Crankshaft 1 Refer to removal sectio n.
5-59 CRANKCASE AND CRANKSHAFT REMOVING THE CRANKCASE BEARING 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.
5-60 CRANKCASE AND CRANKSHAFT DISASSEMBLING THE CRANKCASE 1. Separate: • Right crankcase • Left crankcase Separation steps: a. Remove the crankcase bolts, hose guide an d clutch cable hold - er. Loosen each bolt 1/4 of a turn at a time and after all the bolts are loos- ened, remove them.
5-61 CRANKCASE AND CRANKSHAFT CHECKING THE CRANKSHAFT 1. Measure: • Runout limit "a" • Small end free play limit "b" • Connecting rod big end side clearance "c" • Crank w idth "d" Out of specification → Replace.
5-62 CRANKCASE AND CRANKSHAFT 4. Apply: • Sealant On the right crankc ase. Clean the contacting surface of left and right crankcase before applying the sealant. 5. Install: • Dowel pin "1" • O-ring "2" • Right crankcase To left crankcase.
5-63 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" section. Separate the crankcase. Refer to "CRANKCASE AND CRANK- SHAFT" section.
5-64 TRANSMISSION, SHIFT CAM AND SHIFT FORK REMOVING THE TRANSMISSION 1. Remove: • Main axle "1" • Drive axle "2" • Shift cam • Shift fork 3 • Shift fork 2 • Shift fork 1 • Remove assembly with the collar "3" installed to the crankcase.
5-65 TRANSMISSION, SHIFT CAM AND SHIFT FORK • Be sure the circlip sharp-edged cor- ner "a" is po sitioned oppo site side to the washer and gear "b". • Install the circlip with its ends "c" settled evenly on the spline crests.
6-1 FRONT WHEEL AND REAR WHEEL CHASSIS FRONT WHEEL AND REAR WHEEL REMOVING THE FRONT WHEEL Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". 1 Bolt (axle holder) 4 Only loosening.
6-2 FRONT WHEEL AND REAR WHEEL REMOVING THE REAR WHEEL Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". 1 Nut (rear wheel axle) 1 2 Rear whe el axle 1 3 Drive chain puller 2 4 Rear wheel 1 Refer to removal section.
6-3 FRONT WHEEL AND REAR WHEEL HANDLING NOTE Support the machine securely so there is no dange r of it falling over. REMOVING THE REAR WHEEL 1. Remove: • Wheel "1" Push the wheel forward and remove the drive chain "2". REMOVING THE WHEEL BEARING 1.
6-4 FRONT WHEEL AND REAR WHEEL 2. Install: • Brake disc "1" • Bolt (brake disc) "2" Tighten the bolts in stage, using a crisscross pattern. 3. Install: •C o l l a r " 1 " Apply the lithium soap base grease on the oil seal lip.
6-5 FRONT WHEEL AND REAR WHEEL 2. Install: • Brake disc "1" • Bolt (brake disc) "2" Tighten the bolts in stage, using a crisscross pattern.
6-6 FRONT BRAKE AND REAR BRAKE FRONT BRAKE AND REAR BRAKE REMOVING THE FRONT BRAKE Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". Drain the brake fluid. Refer to removal section.
6-7 FRONT BRAKE AND REAR BRAKE REMOVING THE REAR BRAKE Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". Rear wheel Refer to "FRONT WHEEL AND REAR WHEEL" section.
6-8 FRONT BRAKE AND REAR BRAKE DISASSEMBLING THE BRAKE CALIPER Order Part name Q'ty Remarks A. Front B. Rear AB 1P a d p i n 1 1 2 Brake pad 2 2 3 Pad support 1 1 4 Brake caliper piston 2 1 Re fer to removal section. 5 Brake caliper piston dust s eal 2 1 Refer to removal section.
6-9 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 Reserv oir float 1 4 Brake master cylinder boot 1 5 Circlip 1 Use a long nose circlip pliers.
6-10 FRONT BRAKE AND REAR BRAKE HANDLING NOTE Support the machine securely so there is no dange r of it falling over. DRAINING THE BRAKE FLUID 1. Remove: • Brake master cylinder cap "1" • Protector (rear brake) Do not remove the diaphragm.
6-11 FRONT BRAKE AND REAR BRAKE 4. Inspect: • Brake master cylinder piston "1" • Brake master cylinder cup "2" Wear/damage/score marks → Re- place brake master cylinder kit.
6-12 FRONT BRAKE AND REAR BRAKE 4. Install: • Pad pin plug "4" INSTALLING THE REAR BRAKE CALIPER 1. Install: • Pad support "1" • Brake pad "2" • Pad pin "3" • Install the brake pads with th eir pro- jections "a" into the brake caliper re - cesses "b".
6-13 FRONT BRAKE AND REAR BRAKE 2. Install: • Brake lever "1" • Bolt (brake lever) "2" • Nut (brake lever) "3" Apply the silicone grease on the brake lever sliding surface, bolt an d contacting surface of the brake mas- ter cylinder piston.
6-14 FRONT BRAKE AND REAR BRAKE 3. Install: • Brake hose hol der "1" • Nut (brake h ose holder) "2" Align the top "a" of the brake hose holder with the paint "b" of the brake hose. 4. Pass the brake hose through the front brake hose guides "1".
6-15 FRONT BRAKE AND REAR BRAKE 3. Inspect: • Brake fluid level Fluid at lower l evel → Fill up. Refer to "CHECKING THE BRAKE FLUID LEVEL" section in the CHAPTER 3.
6-16 FRONT FORK FRONT FORK REMOVING THE FRONT FORK Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". Front wheel Refer to "FRONT WHEEL AND REAR WHEEL" section.
6-17 FRONT FORK DISASSEMBLING THE F RONT FORK Order Part name Q'ty Remarks 1 Front fork cap bolt 1 Refer to removal section. 2 Fork spring 1 Drain the fork oil. 3 Dust seal 1 Refer to removal sectio n. 4 Stopper ring 1 Refer to removal section. 5 Inner tube 1 Refer to removal section.
6-18 FRONT FORK HANDLING NOTE Support the machine securely so there is no dange r of it falling over. The front fork requires careful atten- tion. So it is recommended that the front fork be maintained at the deal- ers.
6-19 FRONT FORK The bending value is shown by one half of the dial gauge reading. Do not attempt to straighten a bent inner tube as this may dangerous- ly weaken the tube . CHECKING THE OUTER TUBE 1. Inspect: • Outer tub e "1" Score marks/we ar/damage → Re- place.
6-20 FRONT FORK 8. Install: • Outer tub e "1" To inner tube "2". 9. 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".
6-21 FRONT FORK Be sure to install the spring guide "2" when checking the oil level. Never fail to make the oil level ad- justment between the maximum and minimum level and always ad - just each front fork to the same setting. Uneven adjustmen t can cause poor h andling and loss of stability.
6-22 FRONT FORK 3. Adjust: • Front fork top end "a" 4. Tighten: • Pinch bolt (upper bracket) "1" • Pinch bolt (lower bracket) "2" Tighten the lower brac ket to speci- fied torque. If to rqued too much, it may cause the fron t fork to mal- function.
6-23 HANDLEBAR HANDLEBAR REMOVING THE HANDLEBAR Order Part name Q'ty Remarks Headlight 1 Hot starter cable 1 Disconnect at the lever side. 2 Hot start er lever holder 1 3 Clutch cable 1 Disconnect at the lever side. 4 Clutch lever holder 1 Disconnect the clutch switch lead.
6-24 HANDLEBAR REMOVING THE BRAKE MASTER CYLINDER 1. Remove: • Brake master cylinder bracket "1" • Brake master cylinder "2" • Do not let the brake master cylin- der hang on th e brake hose. • Keep the brake master cylin der cap side horizontal to prevent air from coming in.
6-25 HANDLEBAR 5. Install: • Right grip "1" •C o l l a r " 2 " Apply the adhesive o n the tube guide "3". • Before applying the adhesive, wipe off grease or oil on the tube guide surface "a" with a lacquer thinner.
6-26 HANDLEBAR 12. Install: • Clutch cable "1" • Hot starter cable "2" Apply the lithium soap base grease on the clutch cable end and hot start- er cable end. 13. Adjust: • Clutch lever free play Refer to "ADJUSTING THE CLUTCH CABLE FREE PLAY" section in the CHAPTER 3.
6-27 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 suitable stand under the engine.
6-28 STEERING 9 Bearing race cover 1 10 Upper bearing 1 11 Lower bearing 1 Refer to removal section. 12 Bearing race 2 Refer to removal sectio n. Order Part name Q'ty Remarks.
6-29 STEERING HANDLING NOTE Support the machine securely so there is no dange r 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 d own.
6-30 STEERING 6. Install: • Washer "1" 7. Install: • Front fork "1" • Upper bracket "2" • Main switch "3" • Front brake hose guide bracket "4" • Temporarily tighten the p inch bolts (lower brack et).
6-31 SWINGARM SWINGARM REMOVING THE SWINGARM Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". Brake hose holder Refer to "FRONT BRAKE AND REAR BRAKE" section.
6-32 SWINGARM DISASSEMBLING THE SWINGARM Order Part name Q'ty Remarks 1 Cap 2 Refer to removal section. 2 Relay arm 1 3 Connecting rod 1 4 Collar 2 5 Oil seal 2 6 Thrust bearing 2 7 Bushing 2 8 Oil seal 8 9 Bearing 10 Refer to remova l section.
6-33 SWINGARM HANDLING NOTE Support the machine securely so there is no dange r of it falling over. REMOVING THE CAP 1. Remove: • Left cap "1" Remove with a slotted-head screw- driver inserted under the mark " a" on the left cap.
6-34 SWINGARM INSTALLING THE SWINGARM 1. Install: • Bushing "1" • Thrust bearing "2" • Oil seal "3" •C o l l a r " 4 " To swingarm "5" Apply the molybdenum disulfide grease on the bushin gs, thrust bear- ings, oil seal lips and contact surfaces of the collar and thrust b earing.
6-35 SWINGARM 10. Tighten: • Nut (connecting rod) "1" 11. Tighten: • Nut (relay arm) "1" 12. Install: •C a p " 1 " Install the right cap with its mark "a" facing forward.
6-36 REAR SHOCK ABSORBER REAR SHOCK ABSORBER REMOVING THE REAR SHOCK ABSORBER Order Part name Q'ty Remarks Hold the machine by placing the suitable stand under the engine. Refer to "HANDLING NOTE". Seat and side cover Refer to "REMOVING THE SEAT, FUEL TANK AND SIDE COVERS" section in the CHAPTER 3.
6-37 REAR SHOCK ABSORBER 1 Locking tie 4 2 Taillight coupler 1 3 CDI unit coupler 3 4 Plastic band 1 5 Clamp (air filter joint) 1 Only loosening. 6R e a r f r a m e 1 7 Bolt (rear shock absorber-relay arm) 1 Hold the swingarm. 8 Bolt (rear shock absorber-frame) 1 9 Rear shock absorber 1 10 Locknut 1 Only l oosening.
6-38 REAR SHOCK ABSORBER HANDLING NOTE • Support the machin e securely so there is no danger of it falling over. • This rear s hock absorber is pro- vided with a separate type tank filled with high- pressure nitro- gen gas.
6-39 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.
6-40 REAR SHOCK ABSORBER 7. Tighten: • Screw (air filter joint) "1" 8. Install: • Plastic band • Taillight coupler • Locking tie Screw (air filter joint): 3 Nm (0.
7-1 ELECTRICAL COMPONENTS AND WIRING DIAGRAM ELECTRICAL ELECTRICAL COMPONENTS AND WIRING DIAGRAM ELECTRICAL COMPONENTS 1. Headlight 2. Multi-function displ ay 3. Engine stop switch 4. Clutch switch 5. Diode 6. Starter relay diode 7. Throttle position sensor 8.
7-2 ELECTRICAL COMPONENTS AND WIRING DIAGRAM WIRING DIAGRAM 1. Headlight 2. Multi-function displ ay 3. Engine stop switch 4. Clutch switch 5. Diode 6. Starter relay diode 7. Throttle position sensor 8. Starter relay 9. Fuse 10. Starting circuit cut-off relay 11.
7-3 IGNITION SYSTEM IGNITION SYSTEM INSPECTION STEPS Use the following steps for checking the possibility of the malfuncti oning engine being attributable to igni tion system failure and for checking the spa rk plug which will not spark. *1 marked: Refer to "CHECKING TH E FUSE" section in the CHAPTER 3.
7-4 IGNITION SYSTEM SPARK GAP TEST 1. Disconnect the ignition coil from spark plug. 2. Remove the ignition co il cap. 3. Connect the dynamic spark tester "1" (ignition ch ecker "2") as shown. • Ignition coil "3" • Spark plug "4" A.
7-5 ELECTRIC STARTING SYSTEM 4. Inspect: • Sealed portion of ignition coil "a" • Spark plug terminal pin "b" • Threaded portion of sp ark plug "c" Wear → Replace. CHECKING THE AC MAGNETO 1. Inspect: • Pickup coil resistance Out of specification → Replace.
7-6 ELECTRIC STARTING SYSTEM INSPECTION STEPS If the starter motor will not operate, use the fo llowing inspection steps. *1 marked: Refer to "CHECKING TH E FUSE" section in the CHAPTER 3. *2 marked: Refer to "CHECKING AND CHARGIN G THE BATTERY" section in the CHAPTER 3.
7-7 ELECTRIC STARTING SYSTEM CHECKING THE COUPLERS AND LEADS CONNECTION 1. Check: • Couplers and leads con nection Rust/dust/looseness/short-circuit → Repai r or replace. CHECKING THE STARTER MOTOR OPERATION 1. Connect the posi tive battery ter- minal "1" and starter motor lead "2" with a jumper lead " 3".
7-8 ELECTRIC STARTING SYSTEM 2. Inspect: • Rubber part "a" Tears/damage → Replace..
7-9 ELECTRIC STARTING SYSTEM REMOVING THE STARTER MOTOR Order Part name Q'ty Remarks Exhaust pipe Refer to "REMOVING THE EXHAUST PIPE AND SILENCER" section in the CHAPTER 3.
7-10 ELECTRIC STARTING SYSTEM DISASSEMBLING THE STARTER MOTOR Order Part name Q'ty Remarks 1 Starter motor front cover 1 2 Washer (starter motor front cover) 1 3 Washer 1 4 Circlip 1 5O - r i n g.
7-11 ELECTRIC STARTING SYSTEM CHECKING AND REPAIRING THE STARTER MOTOR 1. Check: • Commutator Dirt → Clean with 600 grit san dpa- per. 2. Measure: • Commutator diameter "a" Out of specification → Replace the starter motor.
7-12 ELECTRIC STARTING SYSTEM • For installation, align the proj ec- tions on the washer with the slots in the front cover. • Align the match mark "a" on the starter motor yoke with the match mark "b" on the starter motor front cover.
7-13 CHARGING SYSTEM CHARGING SYSTEM INSPECTION STEPS If the battery is not charged, use the followin g inspection steps. *1 marked: Refer to "CHECKING TH E FUSE" section in the CHAPTER 3. *2 marked: Refer to "CHECKING AND CHARGIN G THE BATTERY" section in the CHAPTER 3.
7-14 CHARGING SYSTEM CHECKING THE COUPLERS AND LEADS CONNECTION 1. Check: • Couplers and leads con nection Rust/dust/looseness/short-circuit → Repai r or replace.
7-15 THROTTLE POSITION SENSOR SYSTEM THROTTLE POSITION SENSOR SYSTEM INSPECTION STEPS If the throttle position senso r will not operate, use the follo wing inspection steps. Use the following special to ols in this inspection. Check entire ignition system for connection.
7-16 THROTTLE POSITION SENSOR SYSTEM HANDLING NOTE Do not loosen th e screw (throttle position sensor) "1" except when changing the th rottle position sen- sor due to failur e because it will cause a drop in engine pe rfor- mance. CHECKING THE COUPLERS AND LEADS CONNECTION 1.
7-17 THROTTLE POSITION SENSOR SYSTEM Measure the output voltage accurate- ly with a digital e lectronic voltmeter that gives an easy reading of a small voltage. 10. Put the aligning marks "a" on the throttle position sensor and car- buretor.
7-18 LIGHTING SYSTEM LIGHTING SYSTEM INSPECTION STEPS Refer to th e following flow chart when inspect ing the lighting system for possible problems. • Remove the following p arts before i nspection. 1. Seat 2. Fuel tank 3. Left side cover • Use the following special to ols in this inspection.
7-19 LIGHTING SYSTEM CHECKING THE TAILLIGHT (LEDs) 1. Disconnect the taillight coupler. 2. Connect two jumper leads "1" from the battery terminals to the respective coupler terminal as shown. 3. Check: • LED (for proper operation) Does not light → Replace the tail - light assemb ly.
7-20 SIGNALING SYSTEM SIGNALING SYSTEM INSPECTION STEPS If the speedometer will not operate , use the following inspection steps. *1 marked: Refer to "CHECKING AND CHARGIN G THE BATTERY" section in the CHAPTER 3. • Remove the following p arts before i nspection.
7-21 SIGNALING SYSTEM CHECKING THE COUPLERS AND LEADS CONNECTION 1. Check: • Couplers and leads con nection Rust/dust/looseness/short-circuit → Repai r or replace. CHECKING THE MULTI-FUNCTION DISPLAY INPUT VOLTAGE 1. Disconne ct the multi-function dis- play coupler.
Een belangrijk punt na aankoop van elk apparaat Yamaha WR450F (2008) (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
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In een situatie waarin je al een beziter van Yamaha WR450F (2008) bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de Yamaha WR450F (2008) kunnen verkorten.
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