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| You can send your motor to Thumper and have our staff build you motor for you. Wiesco builds our 81mm piston and we added more skirt to help stabilize the piston in the bore. By adding more skirt we feel that our piston will have a longer life than the stock piston. Our 81mm piston kit has a compression ratio of 12 to 1 and will need to run 93 octane or better.The 270 kit give better botton and mid while still allowing the motor to rev like a stock 250. The complete parts kit includes 81mm piston kit 81mm sleeve (installed in cylinder) Top end gasket kit Jetting kit Oil filter |
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