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Piston Rings???

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Can you run a dual ring piston with only the one upper ring and no lower ring all i need to know is if it would run the same or at all the bike is a 1982 kx 125

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So it wont matter at all it well run almost the same and have no skirt slap

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It will run fine, and with less drag than running two rings.

Piston slap has nothing to do with the number of rings. If the piston-to-cylinder clearance is within spec, slap won't be an issue. If the cylinder is worn, there will be slap, no matter how many rings you run.

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