Yamaha WR 426 F (CJ 02) [2001-2002] - forged pistons

PROX forged piston for Yamaha WR 426 F

The PROX forged piston is intended for the Yamaha WR 426 F (CJ 02) from the entire 2001-2002 model year range. The version is assigned to the engine area and the “Top engine” and “Piston” categories.

Technical execution

The piston is made of aluminum and is a forged design. Piston compression is standard. With a diameter of 94.95 mm and the oversized letter A, the piston has clearly defined dimensions for vehicle assignment.

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

Vehicle assignment

The forged piston fits the Yamaha WR 426 F (CJ 02), built between 2001 and 2002. This assignment serves as a selection aid when coordinating the vehicle model, year of manufacture and the specified piston dimensions.

Factual information

When making the selection, the diameter Ø of 94.95 mm, the oversize letter A and the information Oversize: STD must be taken into account in particular. The piston design is specified as a hollow piston with 5 valve pockets. The piston ring quantity information is set.