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

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

The PROX forged piston is designed for replacement on the engine of the Yamaha YZ 450 F (CJ 21) from the 2016-2017 model year range. Its production from forged aluminum combines the structural properties of a forged piston with equivalent original equipment manufacturer quality.

Function and execution

A patented surface treatment helps reduce friction in the cylinder. The flat crown with raised top and 4 valve pockets is designed as a specific piston shape for the specified engine configuration. The default compression is 12.5:1.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Diameter: Ø 96.97 mm
• Letter oversize: C
• Oversize: +0.02
• Piston compression: standard
• Piston rings: set
• Capacity-related version: 4T
• Piston shape: flat crown with raised top and 4 valve pockets

Vehicle assignment

The forged piston fits the Yamaha YZ 450 F (CJ 21), built between 2016 and 2017. The vehicle assignment refers to this model and this complete year range.

Selection note

The diameter Ø 96.97 mm, the oversize letter C and the oversize specification +0.02 are particularly important for the selection. The technical engine parameters should be compared with the existing version before ordering.