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

PROX forged pistons for Yamaha YZ 450 F (CJ 18), year 2014-2015

The PROX forged piston is intended for replacement on the engine of the Yamaha YZ 450 F (CJ 18) from the years 2014-2015. Its forged aluminum design combines the defined piston geometry with a design for standard compression.

Function and execution

The patented surface treatment is designed to reduce friction in the cylinder. This makes the piston suitable for repair with a component of equivalent original equipment quality. The flat crown with raised top and four valve pockets is tailored to the specified engine configuration.

Technical data

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

Vehicle assignment

The PROX forged piston fits the Yamaha YZ 450 F (CJ 18), built in 2014-2015. The dimensions Ø 96.96 mm, letter B and oversize +0.01 support the selection when overhauling the engine and should be compared with the existing cylinder dimensions.

Selection note

Before ordering, check the specified vehicle variant, the year of manufacture and the piston dimensions. The diameter Ø 96.96 mm, the oversize +0.01 and the standard compression 12.5:1 are particularly important for the selection.