The Athena standard bore cylinder kit is designed for Yamaha YZ 450F and WR 450F 4-stroke models, providing a complete top-end rebuild solution that maintains original engine geometry, displacement, and operating characteristics. Supplied with a cylinder, forged piston, wrist pin, circlips, and full gasket set, the kit ensures OEM compatibility and reliable performance under demanding riding conditions.

Features

• Complete top-end rebuild kit for Yamaha 450 cc 4-stroke engines

• Maintains standard bore and original engine configuration

• Direct replacement compatible with OEM components

• Plug-and-play installation with no modifications required

Specifications

• Bore diameter: 97 mm

• Displacement: 450 cc

• Cylinder material: high-silicon aluminium with wear-resistant coating

• Piston type: forged, CNC-machined

• Piston coating: molybdenum disulphide

• Head gasket type: multi-layer steel (MLS), stainless steel, laser-cut

• Kit contents: cylinder, piston, wrist pin, circlips, gasket kit

• Part number: P400485100107

Vehicle Fitments

• Yamaha YZ 450F (2023–2026)

• Yamaha WR 450F (2024–2026)