Kit piston - Yamaha YZ 250 F 4T ('08-'11) - 250 4T - ProX

Please select the piston size from the box above.

ProX piston kit for Yamaha YZ 250 F (2008-2011) - 250cc 4T. The complete application list can be found below.

Technical specifications:
- standard cylinder diameter (factory diameter): 77.00 mm
- engine type: 4-stroke
- total piston length (B): 40.10 mm
- piston pin diameter (C): 16.00 mm
- compression height (D): 14.30 mm
- pin groove position measured from center (E): -
- pin groove position measured from center (F): -
- internal distance of piston pin (G): 17.30 mm
- piston head shape: flat
- other information: 5 x valve pockets
- manufacturing technology: forged piston
- compression ratio: 13.5:1

Available piston sizes (A):
- A (76.95 mm)
- B (76.96 mm)
- C (76.97 mm)