Forged “C” size piston kit in the standard 77.00 mm bore, engineered for durability and dimensional accuracy with a high-compression design. The crown is hard-anodised and the skirt carries a MOS2 low-friction coating, and the kit is supplied complete for one cylinder.

Features

• Forged aluminium construction 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


• CNC-machined crown for consistent combustion shape


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

Specifications

• Bore size: 77.00 mm (standard)


• Size grade: C (piston diameter approximately 76.96 mm)


• Compression ratio: 13.5:1


• Piston type: Forged aluminium


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


• Approximate weight: 0.344 kg

Cross-Reference OEM Part Numbers

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  FX-40033-C

  
  

Vehicle Fitments

• Yamaha YZ250F 2005–2013


• Yamaha WR250F 2005–2013