Yamaha YZ 250 F (CG 39) [2017-2018] - forged pistons

PROX forged pistons for Yamaha YZ 250 F (CG 39) 2017-2018

The PROX forged piston is designed for the 4-stroke engine of the Yamaha YZ 250 F (CG 39) from 2017-2018. Its specific aluminum alloy supports low-friction function and is designed for reliable operation. The quality meets the OEM standard.

Execution and function

• Forged aluminum version
• Flat crown with raised top
• 4 valve pockets for the design of the piston
• Standard piston compression 13.5/1
• Piston rings as a set

Technical data

• Diameter Ø: 76.96 mm
• Letter oversize: B
• Oversize: +0.01
• Displacement version: 4T
• Material: aluminum
• Piston type: forged

Vehicle assignment

The forged piston fits the Yamaha YZ 250 F (CG 39), built between 2017 and 2018. The assignment refers to this vehicle and this complete year of manufacture.

Selection note

The diameter of 76.96 mm, the oversize letter B and the oversize +0.01 dimension are particularly relevant for the selection. This information enables comparison with the intended engine version before ordering.