Yamaha YZ250(S)/LC 1999–2006 OEM Service Manual (P/N 5XF-28199-30)

• Covers 1999–2006 Yamaha YZ250(S) and YZ250LC motocross models, including 5XF1, 5XF2, and 5XF4 regional variants.
• Original Yamaha publication P/N 5XF-28199-30 (585 pages).
• Features 47 detailed exploded-view diagrams, 8 comprehensive torque-specification tables, 2 complete wiring schematics, precise cable routing diagrams, maintenance interval charts, carburetor setting charts, sectional views, and job instruction charts.
• Explores vital assemblies including the water pump, shift cam, shift fork, front fork, rear shock absorber, swingarm, steering, and clutch.
• Covers detailed service specifications for the solenoid valve system, throttle position sensor (TPS), carburetor, radiator, front brake, and rear brake.

Complete Mechanical Documentation

When you have a bike on the lift, you need exact tolerances. This official PDF documentation details the entire liquid-cooled 249 cm³ two-stroke platform. It organizes every technical system logically, giving you full visual references for engine internals. A distinct advantage of this manual is the inclusion of specific job instruction charts that map out exact removal extents, saving you valuable bench time by preventing unnecessary disassembly during a complex repair. This covers everything from the cylinder head and piston down to the crankshaft and transmission assemblies. Tuning a racing machine requires precision. That is why this guide provides deep coverage of the YPVS power valve system and CDI magneto components. To help you bypass expensive shop labor rates, the text outlines precise step-by-step instructions for intensive tasks like front fork rebuilds, brake system air bleeding, and complete crankcase separation.

Technical Specifications & Setup Data

Working on high-performance motocross builds carries inherent risks, such as handling the highly pressurized nitrogen gas within the rear shock absorber. Always depressurize the suspension and verify component integrity and fluid systems using factory parameters before hitting the track. This manual provides the hard data to safely execute your next repair. The combustion chamber capacity is clearly defined (21.0 cm³ for North American and Australian markets, 21.5 cm³ for Europe). You will find exact assembly data, including the cylinder head bolt torque set at 25 Nm (18 ft-lb). It standardizes the bore and stroke at 66.4 mm by 72 mm.

Need to dial in the intake tract? Piston clearances and reed valve stopper heights are fully mapped out for fine-tuning. The manual also lists the complete coolant system capacity at 1.20 liters, ensuring you have every metric required for professional-grade maintenance.