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General| Bore x Stroke | 77.0mm x 53.6mm |
|---|---|
| Compression Ratio | 13.5:1 |
| Ignition | CDI |
| Final Drive | Chain |
| Front Brake | Hydraulic single disc brake, 250mm |
| Rear Brake | Hydraulic single disc brake, 245mm |
| Front Tire | 80/100-21 |
| Rear Tire | 100/90-19 |
| Length | 85.6 in |
| Width | 32.5 in |
| Height | 51.4 in |
| Ground Clearance | 14.8 in |
| Fuel Capacity | 1.6 gal |
| Valves | 4 |
| Fuel Delivery | Keihin FCR-MX37 |
| Transmission | 5-speed |
| Front Suspension | KYB Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel |
| Rear Suspension | KYB Fully adjustable link-type; 12.4-in travel |
Overview of the Yamaha YZ series and the manual's purpose.
Notations for important information like warnings, notices, and tips.
Crucial safety guidelines for operating the competition-use machine.
Method for locating specific pages using the manual's layout and symbols.
Explanation of the step-by-step procedure format and symbol usage.
Explanation of pictograms used in exploded diagrams and text for specifications.
Identification and explanation of critical labels on the vehicle.
Illustrated diagram labeling key parts of the motorcycle and their functions.
Details on VIN, parts, tools, and initial disassembly preparation.
Procedures for inspecting bearings, oil seals, circlips, and electrical connectors.
Identification of specific tools required for engine and chassis maintenance.
Tools for radiator caps, steering nuts, forks, spokes, and electrical system testing.
Tools for valve systems, clutch service, ignition timing, and valve guides.
Tools for ignition system testing and specification for crankcase sealant.
Description of engine controls, clutch, shift, and brake controls.
Steps for starting the engine, fuel recommendations, and initial break-in procedures.
Torque specifications for frame, engine, steering, suspension, wheel, and brake components.
Detailed instructions for washing the motorcycle and preparing it for storage.
Key dimensions, weight, engine type, displacement, and capacities of the YZ250F.
Detailed specifications for engine, chassis, clutch, carburetor, and other systems.
Schedule for regular inspection and maintenance of engine, chassis, and electrical components.
Pre-ride checklist covering coolant, fuel, engine oil, brakes, wheels, and steering.
Instructions for checking and changing engine coolant, including radiator cap inspection.
Steps for adjusting clutch lever, throttle cable free play, and engine idle speed.
Adjusting throttle grip, hot starter lever, and cleaning the air filter element.
Procedures for checking engine oil level, filling, and changing engine oil.
Checking engine oil pressure and adjusting the pilot screw for optimal fuel mixture.
Detailed procedure for checking and adjusting valve clearance using specific tools.
Guide for selecting adjustment pads and tables for valve clearance data.
Procedures for bleeding brake fluid and adjusting brake lever/pedal positions.
Instructions for replacing brake pads and checking brake fluid levels.
Procedures for checking sprockets, drive chain slack, and adjusting chain tension.
Steps for cleaning fork seals, relieving internal pressure, and adjusting fork damping.
Adjusting front fork compression and rear shock absorber preload/damping based on symptoms.
Checking tire pressure and adjusting suspension settings for different riding conditions.
Procedures for checking and tightening spokes, wheels, and adjusting the steering head.
Diagram and instructions for lubricating various chassis components for smooth operation.
Procedure for inspecting spark plug and troubleshooting ignition system components.
Checking ignition coil resistance, CDI magneto, and neutral switch conduction.
Troubleshooting guide for the throttle position sensor system and its components.
Instructions for removing body panels and fuel tank, including torque values.
Procedure for removing, checking, and installing the exhaust pipe and silencer.
Steps for removing, inspecting, and installing the radiator and associated hoses.
Procedures for removing, disassembling, and checking the carburetor and its parts.
Steps for assembling and adjusting the carburetor, including jet needle and pilot screw settings.
Information on carburetor settings related to atmospheric conditions and symptom-based adjustments.
Procedure for removing cylinder head cover and camshafts, with inspection steps.
Steps for checking cylinder head for warpage and installing the cylinder head assembly.
Procedures for removing, checking, and installing valves, springs, and related components.
Steps for removing, checking, and installing the cylinder and piston assembly.
Procedure for removing, checking, and installing the clutch assembly components.
Procedures for removing, checking, and installing the oil filter element and water pump.
Procedures for removing, checking, and installing the oil pump and oil tank.
Procedures for removing, checking, and installing kick shaft and shift shaft components.
Procedure for removing, checking, and installing the CDI magneto, stator, and rotor.
Steps for removing the engine from the motorcycle, including related components.
Procedures for removing, disassembling, and checking the crankcase and crankshaft.
Procedures for removing, checking, and installing transmission components.
Procedures for removing, checking, and installing front and rear wheels, bearings, and brake discs.
Procedures for removing, disassembling, checking, and installing brake calipers and master cylinders.
Procedures for removing, disassembling, checking, and assembling the front fork.
Procedures for removing, installing, and adjusting the handlebar and related controls.
Procedures for removing, checking, and installing the steering stem, bearings, and ring nut.
Procedures for removing, disassembling, checking, and installing the swingarm and its components.
Procedures for removing, checking, and installing the rear shock absorber assembly.
