Yamaha YZ 250 F (CG 34) [2014-2015] - forged pistons

PROX forged pistons for Yamaha YZ 250 F

The PROX forged piston is designed as a replacement piston for the Yamaha YZ 250 F (CG 34) built in 2014-2015. Its production from forged aluminum combines the defined piston shape with an equivalent original equipment manufacturer quality intended for replacement.

A patented surface treatment helps reduce friction in the cylinder. This means that the piston is tailored to a functional replacement in the upper engine area. The flat crown with a raised top part and four valve pockets represents the specified piston geometry for the vehicle assignment mentioned.

Technical characteristics

• Piston type: forged
• Material: aluminum
• Diameter: Ø 76.96 mm
• Plus Size Letter: B
• Oversize: +0.01
• Piston compression: standard
• Standard compression: 13.5:1
• Version: 4T
• Piston rings: set
• Piston shape: flat crown with raised top and 4 valve pockets

Vehicle assignment

The forged piston fits the Yamaha YZ 250 F (CG 34), built between 2014 and 2015. The assignment refers to this model and this complete year range.

Selection note

The piston diameter of Ø 76.96 mm, the oversize letter B and the oversize specification +0.01 must be taken into account when selecting and comparing the engine components. The standard compression of 13.5:1 supports use as an exchange in its intended design.