The Big Bore Cylinder Kit (Part Number: 11003-K01) is designed to enhance the performance of the 2004–2005 Honda TRX450R Sportrax. This +3mm Big Bore Kit increases the engine displacement to 479cc with a 10.5:1 compression ratio. When paired with the Hot Rods #4160 crankshaft, the displacement increases further to 500cc. The kit includes all necessary components for a complete installation, making it a powerful upgrade option for improved performance.

Features:

• (+3mm Big Bore Kit) increases displacement to 479cc with a 10.5:1 compression ratio.


• Achieves 500cc when paired with Hot Rods #4160 crankshaft.


• Bore size: 97.00mm.


• Includes high-quality Vertex #23531 piston.


• Complete kit with cylinder, piston, rings, pin, clips, and gaskets.

Replacement Parts:

• Replacement Big Bore Cylinder: Order No. 140421


• Replacement Big Bore Piston Kit: Order No. 131453S


• Replacement Big Bore Piston Rings: Order No. 131453SR


• Replacement Big Bore Gasket Kit: Order No. 263953

Vehicle Compatibility:

• Honda TRX450R Sportrax: 2004–2005

Cross-Reference Part Numbers:

• 12101-HP1-670


• ATHENA P400210100007


• S4F09700010A


• P400210160005


• S41316060


• S41317039


• 422-11003K


• 0931-0133


• 733706


• Dec-52


• HR11003K01


• 77000-37


• K8610D300-1ZA


• TW400210100007


• P400210100007 (Size: 97mm Bore)