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Athena 290CC kit

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Anybody using this kit? I did a search but didnt find anybody who's actually run one? I had a 250F and sold it for a 450 and have now sold that too and I'm looking at what to buy in the spring time.......Im thinking this big bore kit might be the ticket but was curious if head work was needed to keep compression ratio around stock or if that was done with the piston shape????

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