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

PROX forged pistons for Yamaha YZ 450 F (CJ 21)

The forged PROX 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 an aluminum design with standard compression tailored to the engine.

Function and execution

The patented surface treatment helps reduce friction in the cylinder. The flat crown with raised top and four valve pockets is tailored to the specified engine configuration. The piston is forged from aluminum and has a diameter of 96.96 mm.

Technical data

• Brand: PROX
• Piston type: forged
• Material: aluminum
• Diameter: Ø 96.96 mm
• Piston compression: standard
• Standard compression: 12.5:1
• Letter oversize: B
• Oversize: +0.01
• Piston rings: set
• Displacement/engine version: 4T
• Specificity: flat crown with raised top / 4 valve pockets

Vehicle assignment

The PROX forged piston fits the Yamaha YZ 450 F (CJ 21), built between 2016 and 2017.

Selection note

In addition to the vehicle and year of manufacture, the specified dimensions are also crucial for the assignment: Ø 96.96 mm, oversize +0.01 and the code letter B. This data should be compared with the existing engine structure before selection.