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You can go to the 100c kit, but with a stock crank your actual size is 81cc with the 100cc kit. These kits commonly fail because of the high compression, matched with a correct 100cc head and not a re-machined 50cc they do great, I usually get about 50mph out of a 100cc bbk, With the stroker crank from Scrappydog you can get 87 true cc's, and it is much better quality than stock Chinese parts
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