Table of Contents

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2009
SERVICE MANUAL
YFM25RY
YFM25RSEY
YFM25RSE2Y
LIT-11616-22-09
4D3-28197-11

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Table of Contents
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Summarization of Contents

GENERAL INFORMATION
IDENTIFICATION
Details on vehicle identification numbers and labels.
IMPORTANT INFORMATION
Guidelines for removal, disassembly, and replacement parts.
CHECKING THE CONNECTIONS
Procedure for inspecting electrical leads, couplers, and connectors.
SPECIAL TOOLS
List of essential tools for maintenance and assembly with part numbers.
SPECIFICATIONS
GENERAL SPECIFICATIONS
Key dimensions, weight, engine type, and fuel capacity details.
ENGINE SPECIFICATIONS
Detailed engine measurements, clearances, and component specifications.
CHASSIS SPECIFICATIONS
Specifications for suspension, wheels, brakes, and drive chain.
ELECTRICAL SPECIFICATIONS
Details on system voltage, ignition, charging, and starting systems.
TIGHTENING TORQUES
Torque values for various engine and chassis fasteners.
LUBRICATION POINTS AND LUBRICANT TYPES
Specifies lubrication points and recommended lubricants for engine components.
CABLE ROUTING
Instructions for proper routing of electrical wires and control cables.
PERIODIC CHECKS AND ADJUSTMENTS
PERIODIC MAINTENANCE
Maintenance schedule for emission control system and general checks.
ENGINE
Procedures for adjusting engine components like valve clearance and idling speed.
CHASSIS
Maintenance and adjustment procedures for brakes, suspension, and drive chain.
ELECTRICAL SYSTEM
Checks and replacements for electrical components like bulbs and fuses.
CHASSIS
FRONT WHEEL
Procedures for removing, checking, and installing front wheels and brake discs.
REAR WHEEL
Procedures for removing, checking, and installing rear wheels and hubs.
REAR AXLE AND REAR AXLE HUB
Steps for removing, checking, and installing the rear axle and hub assembly.
FRONT BRAKE
Procedures for inspecting and servicing front brake pads, calipers, and master cylinder.
REAR BRAKE
Procedures for inspecting and servicing rear brake pads, calipers, and master cylinder.
HANDLEBAR
Steps for removing, checking, and installing the handlebar and its controls.
STEERING STEM
Procedures for checking and installing the steering stem and related components.
TIE-RODS AND STEERING KNUCKLES
Steps for removing and checking tie-rods and steering knuckles.
FRONT ARMS AND FRONT SHOCK ABSORBER ASSEMBLIES
Procedures for removing and checking front suspension components.
REAR SHOCK ABSORBER ASSEMBLY
Procedures for removing and checking rear shock absorber assemblies.
SWINGARM
Steps for removing, checking, and installing the swingarm.
CHAIN DRIVE
Procedures for checking and installing the drive chain and sprockets.
ENGINE
ENGINE REMOVAL
Steps for removing the engine, muffler, and exhaust pipe.
CAMSHAFT
Procedures for removing, checking, and installing the camshaft and rocker arms.
CYLINDER HEAD
Steps for removing, checking, and installing the cylinder head and related parts.
VALVES AND VALVE SPRINGS
Procedures for removing, checking, and installing valves and valve springs.
CYLINDER AND PISTON
Steps for removing, checking, and installing the cylinder and piston assembly.
CLUTCH
Procedures for removing, checking, and installing clutch components.
OIL PUMP
Steps for removing, checking, and installing the oil pump assembly.
SHIFT SHAFT
Procedures for removing, checking, and installing the shift shaft and stopper lever.
PICKUP COIL ROTOR AND STARTER CLUTCH
Steps for removing and checking pickup coil rotor and starter clutch.
ELECTRIC STARTER
Procedures for removing and checking the starter motor.
CRANKCASE
Steps for separating, checking, and assembling the crankcase.
CRANKSHAFT ASSEMBLY
Procedures for removing and checking the crankshaft assembly.
TRANSMISSION
Steps for removing, checking, and installing the transmission components.
FUEL SYSTEM
FUEL TANK
Procedures for removing and checking the fuel tank and fuel cock.
CARBURETOR
Steps for removing, disassembling, checking, and installing the carburetor.
ELECTRICAL SYSTEM
IGNITION SYSTEM
Information on ignition system circuit diagram and troubleshooting.
ELECTRIC STARTING SYSTEM
Circuit diagram and troubleshooting for the electric starting system.
CHARGING SYSTEM
Circuit diagram and troubleshooting for the charging system.
LIGHTING SYSTEM
Circuit diagram and troubleshooting for the lighting system.
SIGNALING SYSTEM
Circuit diagram and troubleshooting for the signaling system.
CARBURETOR HEATING SYSTEM
Circuit diagram and troubleshooting for the carburetor heating system.
ELECTRICAL COMPONENTS
Checks for switches, bulbs, fuses, battery, relays, and coils.
TROUBLESHOOTING
STARTING FAILURES
Diagnosing and resolving issues related to engine starting problems.
INCORRECT ENGINE IDLING SPEED
Identifying causes and solutions for improper engine idling.
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE
Troubleshooting poor performance at medium and high engine speeds.
FAULTY GEAR SHIFTING
Diagnosing issues with gear shifting and related components.
UNSTABLE HANDLING
Troubleshooting causes of unstable vehicle handling.
FAULTY LIGHTING OR SIGNALING SYSTEM
Diagnosing and resolving problems with lights and signaling systems.

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