Yamaha YZ 250 F (CG 40) [2019] - forged pistons

PROX forged pistons for Yamaha YZ 250 F (CG 40) 2019

The PROX forged piston is designed as a replacement part for the Yamaha YZ 250 F (CG 40) built in 2019. Its forged aluminum design combines the specified dimensions with a standard piston compression suitable for this engine.

Function and execution

The flat crown with raised top part and 4 valve pockets is tailored to the design requirements of the associated engine. The specific aluminum alloy of the PROX forged pistons reduces friction and supports reliable function. The execution corresponds to the OEM equivalent quality.

Technical data

• Brand: PROX
• Piston Type: Forged
• Material: aluminum
• Diameter Ø: 76.95 mm
• Letter oversize: A
• Oversize: STD
• Piston compression: standard 13.5/1
• Displacement/engine information: 4T
• Rings Quantity: Set
• Piston head: Flat crown with raised top / 4 valve pockets

Vehicle assignment

The forged piston fits the Yamaha YZ 250 F (CG 40), built in 2019. The vehicle assignment is limited to this model and year of manufacture.

Selection note

When making the selection, the diameter of 76.95 mm, the oversize letter A and the STD marking should be taken into account in particular. This means that the design can be specifically compared based on the technical data of the existing engine.