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Knocking noise/piston slap

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I have kx 85 and there is a knocking noise and it is very easy to kick. I am thinking that it needs a new top end. I hope it isn't anything in the bottom end. What is causing this to happen and what needs to be fixed/replaced?I will appreciate any help.

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Piston, Piston rings, Wrist Pin, wrist pin bearing (order this OEM), base gasket, and head gasket (usually they sell a top end gasket kit with all the gaskets and seals you need).  Once you get the Cylinder off, you can feel if the rod or crank has any kind of unusual play.  If you haven't done this before, make sure you watch some Youtube videos.  The trickiest thing is getting the cir-clips that hold the wrist pin in.  Stick a rag down in the motor so it doesn't drop in.  You will need a needle nose pliers to install them... and watch out for them flying away.  Bad idea to do the 1st one in your living room if it is carpeted.

Edited by mch

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