Forged piston kit in the standard 77.00 mm bore with a hard-anodised crown and MOS2 low-friction skirt coating, supplied complete for one cylinder to provide a precise high-compression replacement at stock bore for routine rebuilds.

Features

• Forged aluminium piston for strength under sustained thermal load


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


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


• 100% CNC-machined dome for consistent combustion shape


• Supplied with piston, ring set, wrist pin and circlips

Specifications

• Bore size: 77.00 mm (standard)


• Compression ratio: 13.5:1


• Engine type: 4-stroke single, DOHC, 5-valve


• Kit quantity: One cylinder (piston, rings, wrist pin, circlips)


• Typical engine stroke (reference): 53.6 mm

Cross-Reference OEM Part Numbers

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  FX-40033

  
  

Vehicle Fitments

• Yamaha YZ250F 2005–2013


• Yamaha WR250F 2005–2013