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Please help!!!!!!!! I have a 2006 crf250r and it runs great but is almost impossible to start. Hot or cold it just never wants to start. I think that this is partly to do with it running rich. I replaced spark plugs and it was wet and sooty (still didn't start). It backfires when trying to kick start and sometimes bump starts work. Any fixes would b a huge help!

You'll have to go back to basics. Check for spark. Check timing. Check valve clearances. Check for fuel. Check intake and exhaust is free from obstruction.