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very low compression. Need help!!

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Ok i have a 1996 yz 125. I got it awhile ago and i want to do some work on it. I got a compression checker to see the compression and it said it was 50 psi. I do know that my power valves leak and some exhaust comes out the power valve breather tube. Idk if its the compression checker or my bike. Would i have to change rings or replate it idk please help?

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The only way to find out is dis-assembling the engine and inspecting / measuring all the components versus the service manual specs.

You can only 'refurb' a top end with a new piston & ring so many times, eventually the cylinder / plating wears beyond the limits.

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