Yamaha WR 450 F (RE 45) [2018-2019] - forged pistons

PROX forged piston for Yamaha WR 450 F (RE 45)

The PROX forged piston is designed for the Yamaha WR 450 F (RE 45) from the 2018-2019 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

A patented surface treatment is designed to reduce friction in the cylinder. The piston shape has a flat crown with a raised top and 4 valve pockets. This means that the design is specifically tailored to the specified engine configuration.

Technical data

• Piston Type: Forged
• Material: aluminum
• Diameter: Ø 96.97 mm
• Letter oversize: C
• Oversize: +0.02
• Piston compression: standard
• Standard compression: 12.5:1
• Piston rings: set
• Engine type: 4T
• Piston head: Flat crown with raised top / 4 valve pockets

Vehicle assignment

The forged piston fits the Yamaha WR 450 F (RE 45), built between 2018 and 2019. The vehicle assignment refers to this complete model and year range.

Selection guide

The diameter Ø 96.97 mm, the oversize +0.02 and the marking C must be compared with the requirements of the motor before selection. The default compression of 12.5:1 supports unique mapping within the specified execution.