Yamaha YZ 250 F (CG 40) [2019-2021] - forged pistons

PROX forged piston for Yamaha YZ 250 F (CG 40)

The PROX forged piston is intended for the Yamaha YZ 250 F (CG 40) from the years 2019-2021. Its forged aluminum design combines a resilient construction with a standard compression suitable for the engine.

The specific aluminum alloy is designed to reduce friction and support reliability. The design corresponds to OEM-level quality and is suitable as a precisely defined component for the revision of the upper engine area.

Technical features

• Piston Type: Forged
• Material: aluminum
• Piston compression: standard
• Diameter Ø: 76.97 mm
• Letter oversize: C
• Oversize: +0.02
• Piston rings: set
• Stroke: 4T
• Specificity: Flat crown with raised top and 4 valve pockets

Vehicle assignment

The forged piston is suitable for the Yamaha YZ 250 F (CG 40), built between 2019 and 2021. The selection should be based on this complete vehicle assignment as well as the specified dimensions and design.

Execution for the engine overhaul

With a diameter of 76.97 mm, the oversize +0.02 and the oversize letter C, the piston offers clearly defined characteristics for the right selection. The flat crown with raised top and 4 valve pockets takes into account the specified piston shape for the 4T engine.