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weird back firing

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RUNNIN_XTM_pro24.7

RC Newbie
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when i engage up to full throttle my motor makes a crazy back firing noise and i dont know what causes it can anybody help me.
 
hmm sounds like you may be running rich on the LSN. Hopefully you are running the correct plug. If your Mill requires a shorty and you are using a long plug that will cause some damage to your piston knocking on the plug oraface. And The other way around changes the timing on combustion. Is this your ride or are you helping out a friend? If not and it is yours I would sit down and read up on the engine manual.

Let us know

Jon
 
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