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2014 Kx450

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I just rebuilt the top end on my 450 which is a 2014. I used a wiseco piston for a 2009 which I was told are the same engine. Has anyone experienced problems with this? Mine keeps backfiring mid throttle. Ive checked the exhaust for leaks and tried my stock exhaust and have no change. Timing is correct and replace the spark plug for simple checks.

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