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Camshaft, rocker arms were destroyed dut to lack of oil. Repaired. Pulled jug to clean out shavings in engine. I checked bore it was ok, piston ok. Rings looked good. Can i re-use old rings ,will they seal. Or should i just install new rings. STandard size?
 

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Don't reuse the old rings. They are already surface worn into the old bore, plus they've already been heat treated once so they're not far off from losing their spring tension.
 

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You know, when I put my Prairie 400 back together I ordered a high compression piston. I sent the cylinder off to be bored, I packed up the whole thing so that the machine shop could endgap the rings for me. The guy said he checked them and they were exactly in spec. I was really impressed but it also brings into stark contrast the quality assurance of new manufacturing processes. It's old wisdom to have a ring endgap grinder handy whenever you rebuild an engine because old engines NEEDED to have the ring endgap filed. These new engines (and replacement parts) are to such a degree of accuracy that it's almost unnecessary to bother checking endgap unless there is some problem while putting the engine together.
 
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