CYLINDER FULL KIT 98MM YAMAHA YFZ 450 09-25, ATHENA P400485100047 478CC BIG BORE, (Piston included)

This big bore cylinder kit increases engine capacity to 478 cc and is supplied as a complete replacement assembly, including an aluminium cylinder with a nickel-silicon wear-resistant coating, a piston assembly, and all required gaskets. It is designed to install without modifications to the engine crankcase and is intended for high-temperature, high-load operation.

Features

• Big bore cylinder kit supplied as a complete set for top-end replacement

• Wear-resistant nickel-silicon cylinder coating for reduced friction and improved durability

• Includes cylinder, piston, piston pin, piston rings, and full gasket set

• Designed for installation without engine crankcase modifications

• Developed and validated through bench and road testing

Cross reference

• S4F09800004A Piston Kit 97,94
• S4F09800004B Piston Kit 97,95
• P400485160013 Gaskets Kit
• S41316197 Rings

Specifications

• Bore diameter: 98.00 mm

• Displacement: 478.00 cc

• Compression ratio: 12.5:1

• Net weight: 1.17 kg

• Cylinder material: aluminium

• Cylinder coating: nickel-silicon (Motor-Nicksil)

Vehicle Fitments

• YAMAHA YFZ R 450 cc (2009–2025)

• YAMAHA YFZ X 450 cc (2010–2011)