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02 crf450 wont start

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Two weeks ago the bike ran fine. Started up cold and hot with no problem. I go to start it the other day and nothing. I replace the plug, clean out the carb, change the air cleaner and oil, still nothing. If I bump start it and warm it up it runs fine. But once you shut it off, nothing. Any ideas? Thanks guys.

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Two weeks ago the bike ran fine. Started up cold and hot with no problem. I go to start it the other day and nothing. I replace the plug, clean out the carb, change the air cleaner and oil, still nothing. If I bump start it and warm it up it runs fine. But once you shut it off, nothing. Any ideas? Thanks guys.

I am not an expert by any means, but just from the reding the forums here, that sounds like a valve problem, what Kind of problem, I dont know... but I have read a few post where people have never had a valve problem, then they go to start there bike and it wont start, cause the valves were jacked...

I have an 2002 also, and love it... i have been lucky so far... no major issues...

i would say, check ur valves, then post on here what the results are and someone will def. point you in the right direction...

:thumbsup:

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What xxxxshiftxxxx said above. That is quite consistant with a/tight valve: you can bumpstart it, warm it up and it's OK for the day but cold = no start.

Check your valve clearance. One of the intakes is probably zero........hope this helps :thumbsup:

by the way: go SS on the intakes => problems go away!!!

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