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2006 KX250F Wont start, Please help

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Have you checked the valves clearances ?

Are you sure the cam timing is correct as backfiring like that can be incorrect timing .

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Have you checked the valves clearances ?

Are you sure the cam timing is correct as backfiring like that can be incorrect timing .

Im pretty sure because the cams are new and they are stock. at TDC on the flywheel, the cam markings are lined up with the head. And also the cam lobes seem to be in the proper places. I have had problems all summer, because i bought the bike and the exhaust cam was spun, but it had been welded so then  it destroyed 2 exhaust valves, and valve buckets. I put everything back together with new cams and i figure i have the clearances correct and it still wont start, just backfiring. ( when it backfires i get a huge flame out the exhaust)

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I don't think you understand what valve clearances are, I would suggest you get a owner's manual and read up about it, or have a look on youtube to learn how to check them.

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