Yamaha YZ 450 F (CJ 21) [2016-2017] - forged pistons

PROX forged pistons for Yamaha YZ 450 F

The PROX forged piston is designed for the Yamaha YZ 450 F (CJ 21) built in 2016-2017. It is suitable for replacement in equivalent original equipment quality and combines a forged aluminum design with a patented surface treatment. This machining is designed to reduce friction in the cylinder.

Function and execution

The flat crown with raised top and 4 valve pockets is tailored to the specified engine configuration. As a 4T piston, the component has a standard compression of 12.5:1. Manufacture from a special alloy supports the balance between performance and reliability, intended for use as a replacement piston.

• Piston Type: Forged
• Material: aluminum
• Diameter Ø: 96.95 mm
• Piston compression: standard
• Standard compression: 12.5:1
• Letter oversize: A
• Oversize: STD
• Rings Quantity: Set
• Stroke: 4T
• Specificity: Flat crown with raised top / 4 valve pockets

Vehicle assignment

Suitable for the Yamaha YZ 450 F (CJ 21), built between 2016 and 2017. Before ordering, the model name, year of manufacture and the listed piston dimensions and specifications should be compared with the existing engine.