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) built between 2003 and 2004. As a forged aluminum version, it offers a solid basis for repairing the upper engine area. The special alloy is designed to minimize friction and thereby support reliable operation.

Technical features

• Piston Type: Forged
• Material: aluminum
• Piston compression: standard
• Diameter Ø: 94.95 mm
• Letter oversize: A
• Oversize: STD
• Rings Quantity: Set
• Stroke: 4T
• Specificity: hollow piston / 5 valve pockets

Vehicle assignment

This forged piston is assigned to the Yamaha WR 450 F (CJ 04) in the full 2003-2004 model year range. Before ordering, check the model name and the specified piston dimensions so that the selection fits your motorcycle and the intended engine structure.

Selection guide

The combination of standard piston compression, a diameter of 94.95 mm, the oversize letter A and the STD marking makes classification within the technical data easier. The design as a hollow piston with 5 valve pockets describes the specific piston shape and should be taken into account when selecting.