Yamaha WR 450 F (RE 45) [2020] - forged pistons

PROX forged pistons for Yamaha WR 450 F 2020

The PROX forged piston is designed for the Yamaha WR 450 F (RE 45) built in 2020. As a piston for a 4-stroke engine, it combines a forged design with standard compression and a flat crown with a raised top. The four valve pockets take into account the design requirements of the cylinder head.

Function and execution

The piston is made of aluminum and is made from a specific aluminum alloy. This design is designed to reduce friction and support reliable function. The design corresponds to OEM quality and is suitable for use as a replacement piston with close-to-production compression.

Technical data

• Piston type: forged
• Material: aluminum
• Piston compression: standard
• Diameter Ø: 96.95 mm
• Letter oversize: A
• Oversize: STD
• Rings Quantity: Set
• Stroke: 4T
• Flask shape: flat crown with raised top
• Valve pockets: 4

Vehicle assignment

Suitable for the Yamaha WR 450 F (RE 45), built in 2020. The assignment applies to this entire year range.

Selection note

When making the selection, particular attention should be paid to the diameter of 96.95 mm, the marking A, the STD version and the standard compression. The information on piston shape and 4-stroke design supports the comparison with the intended engine.