Yamaha YZ250(S)/LC 1999-2006 Service Manual (585 P.)

1999–2006 Yamaha YZ250(S)/LC Factory Service Manual

• 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, and 2 complete wiring schematics.
• Instant download — get straight to work the second you check out. The high-resolution print format preserves every visual detail.

Complete Mechanical Documentation

When you have a bike on the lift, you need exact tolerances, not guesswork. This official 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. 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 manual provides deep coverage of the YPVS power valve system and CDI magneto components.

Technical Specifications & Setup Data

Working on high-performance motocross builds carries inherent risks. Always verify component integrity and fluid systems using factory parameters before hitting the track. This manual provides the hard data to do exactly that. 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? Intake valve 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.