Yamaha WR 250 F (RE 25) [2016-2017] - forged pistons

PROX forged piston for Yamaha WR 250 F (RE 25)

The PROX forged piston is designed as a replacement solution in equivalent original equipment quality for the Yamaha WR 250 F (RE 25) from the 2016-2017 model year range. The aluminum production and the forged design combine the structural properties of a forged piston with a precisely defined dimensional design.

Function and execution

A patented surface treatment helps reduce friction in the cylinder. The flat crown with raised top and 4 valve pockets is tailored to the specified piston configuration. The piston has a standard compression of 13.5:1.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Diameter Ø: 76.97 mm
• Oversize: +0.02
• Letter oversize: C
• Piston compression: Standard, 13.5:1
• Piston rings: set
• Displacement version: 4T
• Specificity: Flat crown with raised top / 4 valve pockets

Vehicle assignment

Suitable for Yamaha WR 250 F (RE 25), built between 2016 and 2017.

The diameter of 76.97 mm and the C marking serve as important selection criteria for the intended replacement. Before ordering, these dimensions should be compared with the existing engine configuration.