Forged “B” size piston kit for Yamaha YZ450F (2014–2019) in the standard 97.00 mm bore. Designed as a precise replacement for one cylinder, it includes the piston, ring set, wrist pin and circlips, with surface treatments to support durability and stable running in modern four-stroke motocross applications.

Features

• Forged aluminium construction for high strength under thermal load


• Hard-anodised crown to resist heat and reduce carbon build-up


• MOS2 (molybdenum disulphide) skirt coating to lower friction and aid running-in


• Precision CNC-machined crown for consistent combustion shape


• Supplied complete with piston, rings, wrist pin and circlips

Specifications

• Bore size: 97.00 mm (standard)


• Size grade: B


• Typical piston diameter: approximately 96.96 mm


• Piston type: Forged aluminium


• Manufacturer reference: FX-40049-B


• Kit quantity: One cylinder (piston, ring set, wrist pin, two circlips)

Vehicle Fitments

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  Yamaha YZ450F 2014–2019