Enduro machines get taken apart often, and this is the book Yamaha wrote for the job. Publication LIT-11626-15-44 covers the 2002 WR250F, model code WR250FB, and that year alone.
Why the factory text
A four-stroke competition engine is unforgiving about clearances. The manual states valve clearance figures, piston and cylinder service limits, tightening torques and the shimming procedure as the factory specified them, so a rebuild ends with the bike in spec rather than approximately right. Suspension, fuel system and electrical sections are covered to the same standard, with full diagrams.
Check WR250FB against the code on your frame before ordering; the WR250F suffix changes every season.
Troubleshooting is arranged by symptom, and the maintenance chapter gives intervals with the settings attached, which together cover most of what a first-year owner will actually need. The overhaul detail sits behind that for when more comes apart than planned.
