Yamaha YZ 450 F (CJ 18) [2014-2015] - forged pistons

PROX forged pistons for Yamaha YZ 450 F (CJ 18)

The PROX forged piston is intended for the Yamaha YZ 450 F (CJ 18) from the entire 2014-2015 model year range. It is suitable for replacement in equivalent original equipment quality and combines a forged design with a special aluminum alloy.

Function and execution

The patented surface treatment helps reduce friction in the cylinder. The flat crown with raised top part and four valve pockets is tailored to the specified piston geometry. The piston has a standard compression of 12.5:1.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Diameter Ø: 96.95 mm
• Piston compression: standard
• Compression ratio: 12.5:1
• Letter oversize: A
• Oversize: STD
• Displacement version: 4T
• Piston rings: set
• Piston shape: Flat crown with raised top and 4 valve pockets

Vehicle assignment

Suitable for the Yamaha YZ 450 F (CJ 18), built between 2014 and 2015. The vehicle assignment refers to this model and this year of manufacture.

Selection note

The diameter of 96.95 mm, the marking A, the STD version and the standard compression 12.5:1 are particularly important for the selection. These technical features should be compared with the existing engine structure before ordering.