Valve Adjustment

Has anybody had to adjust their valves yet, and if so, how long (hours or miles) did it go before you had to have them adjusted?

I have a friend who has an 02 YZ250F and has ridden/raced it quite a bit and says he has not had to adjust them yet.

Anybody elses experience?


About 20 hrs. on mine, 4 of the 5 shims had to be changed. It had become hard to start when hot and it's very easy now.

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