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Picked up '97 CR125. Piston and rings questions.

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Ok, compression is almost nonexistent and the plan is to put new rings and maybe a piston in. We've removed the head to take a look inside. How do we know what exactly we need to order? We are rookies at this, but have mechanical skills. 

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Don't order any parts until the cylinder has been inspected (damage, worn plating etc.)

Any scratches or gouges that can be felt when dragging a fingernail across it ?

 

If the cylinder if still serviceable, you must then measure the bore to know which piston size to order.

 

Check for connecting rod up/down play.

With such an old engine, don't take chances and replace both crankshaft seals.

Edited by mlatour

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