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Noise?? Normal???

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I just purchased my drz s runs great. I have read other post about piston slap or other engine noise. I'm getting a slap or a knock when I left off the gas and just cruising slow or the back pressure of the engine. When I give it gas it shuts up or pull in the clutch and rev engine its quiet. I thought it might have been the chain, adjusted no luck. Should I be concerned or is this normal?

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short piston skirt + lugging it = piston slap

DON'T LUG THE BIKE, IT REALLY LIKES TO REV AND YOU WON'T HURT IT :thumbsup:

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