[pappa t]

I've just bought a 2006 crf 250 x,I don't know any history of the bike so I've decided to rebuild the engine.
What should I be replacing? I know the valves give problems on these so I will change them.
Big end bearing seems ok but should I change it just to be safe? What about main bearings,transmission bearings etc.
Any advice would be appreciated.

[crfsonly]

Welcome to CRF's Only!

If you are replacing the valves the seats need to be professionally cut. We offer these services a long with all engine parts required. When replacing valves it's a good time to evaluate the piston and replace if on or near the margin. The crank/rod are typically pretty solid. If you don't see any bronze-like material in the oil filter and the crank doesn't have any up/down play and is in spec laterally then I'd run with it for now.

Ken