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zx12r starting probems

  1. 2004 zx12r

    I have a 2004 ZX12R I put a 2003 motor on it it's not trying to fire is just spinning over and it's getting a backfire and getting Flames coming out the pipe what is the solution to this problem. Btw I took the cam sensor out of the 04 and put it in the 03 because the 03 I bought didn't come...