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[QUOTE="JWW, post: 739310, member: 17971"]
Last weekend my son was riding his KX100 when it appeared to have seized. He was between 3/4 and full throttle when it bogged down and died. I rotated the kick-starter with my hand and heard what sounded like metal on metal grinding.

I pulled the cylinder and the piston and rings appear to be fine. The only exception is the top edge of the piston has a small rolled edge. It looks as if someone took a small hammer and dented the edge. The cylinder is absolutely clean and smooth. It shows no sign of the rolled edge hitting it.

If I grab the rod and move it left to right it seems to have an excessive amount of play. The top end of the rod moves a little over 1/8" overall side to side. If I look down into the crank nothing appears to be cracked or broken.

What is the actual procedure for checking the connecting rod play at the bottom?

Is it possible that the rolled edge caused the problem?

I’m tempted to put the new piston and rings and give it a shot. My only concern is turning a minor bottom end problem into a major one.

Any tips, thoughts or advice?

Thanks
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