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Crf250 won't start when kicked

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Hi,I've just rebuild my crf250 and the only way I've been able to start it was by pushing it and starting it,I would like to know what the problem might be,could it be just to move back or forward one tooth on the cam or would it be something more complicated

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Did you check your timing? How are you setting your timing? Did you check your valve clearances?

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What parts have you replaced? A new piston is not a "rebuild", there are a ton of other wear components on these motors.

Start by confirming the timing is correct, and that the valve clearances are in spec.

Edited by nzgsr

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