+1 My son just grenaded a perfectly good KX100 engine this way! And I have the bad piston, trashed cylinder and empty wallet to prove it. :nod:2strokerfun said:Don't let off the gas quickly from running wide open. Your fuel flow is your oil flow, which lubricates your piston. By suddenly letting off the throttle, you are going from wide open oil intake to the pilot-jet-only intake, which does not give you enough oil to lubricate that very very hot and expanded piston. You are seizing the piston from lack of lubrication when you go from wide open to closed too quickly.
TCYFudge said:no i didn't mean i shaved down a bigger piston. it was only rubbing against the cylinder in a couple spots. its the right size piston. and thanks for your help everyone. and i normally do pull in the clutch and after it was seizing on me i would pull in the clutch and give it some gas when decelerating and it never did it.
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