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Balances power enhancements into a lightweight extruded aluminum oval canister design
The EXO-ST1400 EVO builds upon the lightweight performance and advanced features of its
Utilizes all stock sensors
OEM # 25416-70F
Additional Pinlock MaxVision shield and Pinlock anti-fog insert included
Athena P400485100068 Big Bore Cylinder Kit (496cc) - 102.00mm, 12.2:1 Compression engine-gaskets-seals-base-gaskets Balances power enhancements into aKits include aluminum cylinder with nickel carbide coating designed with larger water jackets. Includes Forged piston, rings, clips and pin. Athena top end gasket set includes required seals and hardware. Easy to follow step by step installation instructions. Most are bolt on; no machining required except where noted. Vehicle Fitment: 2018 2021 Yamaha YZ450F
