Question about 2001 KTM MXC 250

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Knocking noise on kx 85

Could this be top end bearing.ihave taken barrell off.should con rod have slight movement side to side

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The rod should move side to side this is called little end side shake. the correct amount is .8mm to 1.3mm make sure the rod does not have any movement up and down on the bearing.If this is all good your knock may be from a worn piston. If its more of a grinding sound it could be the crank bearings.
-john

Posted on Jun 18, 2009

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Yes, the side play should be there but no play at all up and down. If your KTM has a needlebearing on the piston pin, replace the bearing. De-carbon the top end. Burn only premium gas and don't use any gas with Ethanol.

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Posted on Jun 18, 2009

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