Question about 2005 Honda CRF 250 R

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Rebuilt top end and now wont start just backfires but all timing

I got the timing marks lined up and everything eles but it wont start it just backfires sometimes

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Check your shims.prob got a valve open.

Posted on Jul 27, 2009

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If you went by the manuals timing mark instructions you should be fine but i'd bet its still not in time. the lines on the cam should line up parrallel with the head casting, most times it looks like they are but its still one tooth off, i usuall put tensions the chain with my finger to see how parralell they are.. make sure the motor is in top dead center compression also. the manual is what shows your at tdcc.

Posted on Jul 12, 2009

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