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Polaris 1994 400L piston size


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I'm looking at replacing my broken piston in my 1994 400L, the book says that the piston is 3.270 inches and i've had the head measured and it's reading 3.275 inches, the adds i've seen for pistons say .020 or .080 ect, could someone please give me a better idea of exactly what it is i need.

Cheers

Andy

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