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

PROX forged pistons for Yamaha YZ 250 F (CG 40) 2019-2021

The PROX forged piston is designed for the Yamaha YZ 250 F (CG 40) from 2019 to 2021. Its forged aluminum design combines the specified standard compression with a structurally defined piston shape for the 4T engine.

Function and execution

The flat crown with raised top features 4 valve pockets. This means that the top corresponds to the specified characteristics of this piston. PROX describes the aluminum alloy used as reducing friction and designed for reliable operation. The version is manufactured in OEM-equivalent quality and with standard compression.

Technical data

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

Vehicle assignment

The forged piston is assigned to the Yamaha YZ 250 F (CG 40), built in 2019-2021. When making the selection, the specified diameter of 76.95 mm, the marking A and the STD version must be taken into account.

Factual note

Before ordering, please compare the technical characteristics of the existing piston with the information on diameter, oversize letter and oversize. The version is specified for a 4T engine with standard compression.