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

PROX forged pistons for Yamaha WR 250 F

The PROX forged piston is intended for the Yamaha WR 250 F (RE 25) built in 2016-2017. It is suitable as a replacement piston of equivalent original equipment quality and combines a forged design with a specially tailored design for use in the engine.

Function and execution

The piston is made of aluminum and features a flat crown with a raised top and 4 valve pockets. The patented surface treatment helps reduce friction in the cylinder. With the standard compression of 13.5:1, the forged piston is designed for the intended standard version.

Technical data

• Piston Type: Forged
• Material: aluminum
• Diameter Ø: 76.95 mm
• Piston compression: standard
• Standard compression: 13.5:1
• Letter oversize: A
• Oversize: STD
• Rings Quantity: Set
• Stroke: 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.

Selection note

The piston diameter of 76.95 mm, the marking A, the STD version and the standard compression of 13.5:1 are particularly important for the assignment.