Yamaha WR 450 F (CJ 04) [2003-2004] - forged pistons

PROX forged piston for Yamaha WR 450 F (CJ 04)

The PROX forged piston is designed for the Yamaha WR 450 F (CJ 04) in the entire 2003-2004 model year range. Its forged aluminum design combines the verified piston data with a special alloy that helps minimize friction and thus ensure high reliability.

Function and execution

As a replacement part for the upper engine range, the piston is designed to the specified standard piston compression. The design as a hollow piston with 5 valve pockets describes its specific design. The oversize is given as +0.01; the corresponding letter of the oversize is B.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Piston compression: standard
• Diameter Ø (mm): 94.96
• Letter oversize: B
• Oversize: +0.01
• Rings Quantity: Set
• Stroke: 4T
• Specificity: hollow piston / 5 valve pockets

Vehicle assignment

Suitable for Yamaha WR 450 F (CJ 04), built between 2003 and 2004.

Selection note

When making the selection, the diameter Ø 94.96 mm, the oversize +0.01 with the letter B and the standard piston compression should be taken into account.