Hello so my quad used to run good till i put a new spark plug in then it leand way out. The spark plug is powdery white. I put the right one back in and still the same thing. i put one step bigger pilot and my biggest main jet (90) and didnt change it at all. Im driving around 20-30 kmh under half throttle can any one help? Summers almost over and i barely rode this year.

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