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

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

The PROX forged piston is designed for the 4-stroke engine of the Yamaha YZ 250 F (CG 40), built in 2019. Its forged aluminum design combines the specified piston shape with an alloy specifically designed for this application. As a result, the piston supports low friction and reliable function in the engine.

Execution and function

• Piston type: forged
• Material: aluminum
• Piston compression: standard
• Compression rating: 13.5/1
• Flat crown with raised top
• Four valve pockets
• Ring design: set

Technical data

• Piston diameter: 76.96 mm
• Oversize letter: B
• Oversize: +0.01
• Engine type: 4T

The flat crown with raised top and four valve pockets form the specific geometry of this piston. The diameter of 76.96 mm, the marking B and the oversize of +0.01 serve for clear selection within the intended piston design.

Vehicle assignment

Suitable for the Yamaha YZ 250 F (CG 40), full year range: 2019.

Please match the piston diameter, oversize marking and motor version with the existing motor before making your selection. The PROX forged piston is assigned to the engine, upper engine parts and pistons category.