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Can someone rebuild crf for cash in Devon

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Basically long story short I thought I would give it a go at rebuilding my top end put it back together to what I believed was correct and it won't start however it will pop a huge flame out the exhaust every now and again. I really don't want to mess it up anymore than I have with it backfiring so if anyone knows anything I will give them good money to do it.

I did lose a valve shim which I replaced with another one?

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did you get all the timing marks lined up?check your right side crankcase hole (should be shown in the manual and line up the timing marks then check your cam timing marks if they dont line up with the top of the head then you need to adjust your chain!

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