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 designed as a replacement piston in equivalent original equipment quality for the Yamaha YZ 450 F (CJ 18) built in 2014-2015. The forged aluminum design combines the defined piston shape with a standard compression intended for this application.

Function and execution

A patented surface treatment reduces friction in the cylinder. The piston shape has a flat crown with a raised top and 4 valve pockets. This clearly summarizes the relevant features for replacing the piston.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Diameter: Ø 96.97 mm
• Letter oversize: C
• Oversize: +0.02
• Piston compression: standard
• Standard compression: 12.5:1
• Rings Quantity: Set
• Stroke: 4T
• Piston shape: Flat crown with raised top / 4 valve pockets

Vehicle assignment

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

Selection guide

The diameter Ø 96.97 mm, the oversized letter C and the dimension +0.02 support the targeted selection of the right piston. Before ordering, the existing engine dimensions should be compared with these technical data.