I have 1982 YZ100 with low compression and I have the cylinder off what should I do to rebuild?

It runs and I dont know what to how to inspect the cylinder walls? or:It runs and I don't know what to how to inspect the cylinder walls?or:check valv

It runs and I don't know what to how to inspect the cylinder walls?

or:It runs and I don't know what to how to inspect the cylinder walls?

or:check valves for gap, look for scoring on cylinder walls. if none, replace the compression rings on the pistons

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