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| The Honda CRF450 is one of the most popular big bore thumpers on the market. These bikes are being used in MX, Super Moto,Enduro and just for trail riding. We here at Thumper Racing now have 3 new big bore kit for the 450. The 98mm 12.5 to 1 piston kit nets us a 468cc motor while our 99mm piston gives us a 478cc motor. Both of these kits require a steel sleeve be installed into you cylinder. Both kit give better bottom and huge mid range power with out hurting the top end performance. It is recommend that race fuel be used on both of these kits. The complete parts kit includes Installation in motor 99mm piston kit 99mm sleeve (installed in cylinder) Top end gasket kit Jetting kit Oil filter |
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