Athena Manufacturing

68-4990

06-09 YAMAHA YZ450F: Athena Big Bore Kit - 478cc

Rebuild Kits

The Athena 478cc Big Bore kit is the missing source for increasing your motorcycles raw power.The included 478cc cylinder on the Athena Big Bore kit is constructed out of aluminum with a galvanic coating to increase the durability.The water jets have been widened for a higher flow rate, keeping the cylinder cool.Athena built a reliable forged piston that has been molybdenum-coated for high performance use and extended wear life.The Athena Big Bore kit includes a specially designed gasket kit to

The Athena 478cc Big Bore kit is the missing source for increasing your motorcycles raw power.The included 478cc cylinder on the Athena Big Bore kit is constructed out of aluminum with a galvanic coating to increase the durability.The water jets have been widened for a higher flow rate, keeping the cylinder cool.Athena built a reliable forged piston that has been molybdenum-coated for high performance use and extended wear life.The Athena Big Bore kit includes a specially designed gasket kit to accommodate the big bore features.Another great feature of the Athena Big Bore kit is that it bolts on with no machining needed, and includes easy-to-follow step-by-step installation instructions.The Athena 478cc Big Bore Kit includes: cylinder, piston, ring(s), pin, clips, top end big bore gasket kit.

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