ATHENA P5F0770039007B Top End Piston Kit for Yamaha 250 WR-F / YZ-F 2008–2013

Breathe new life into your 4-stroke enduro engine with Athena's Forged Top End Piston Kit. Built for riders who push their machines to the limit, this complete rebuild kit combines a precision-forged piston with Athena's premium top-end gasket kit to deliver race-proven durability and reliable performance. Manufactured using a reverse extrusion forging process and precision CNC machining, the piston offers exceptional strength, superior heat resistance, and consistent power delivery, while premium Japanese piston rings and Athena's advanced gasket technology ensure outstanding sealing and long-lasting reliability.

• Complete top-end rebuild kit featuring a forged 4-stroke piston and premium gasket set
• Reverse-extruded forged aluminum piston for superior strength and durability
• Precision CNC-machined for OEM-quality fit and dependable performance
• Premium Japanese piston rings with wear-resistant coatings reduce friction and extend engine life
• Forged side relief skirt design promotes smoother operation and improved longevity
• Advanced gasket materials provide dependable, leak-free sealing under demanding riding conditions

Includes:

• Forged 4-Stroke Piston
• Piston Rings (3)
• Piston Pin / Wrist Pin
• Circlips
• Complete Top End Gasket Kit

• Piston Size: 76.97mm
• Displacement: 250cc
• Compression Ratio: 13.5:1
• Piston Type: Forged
• Engine Application: Enduro
• Skirt Design: Forged Side Relief
• Compression Height: 22.30mm
• Piston Pin: Standard
• Big End Pin Diameter: 16 x 10 x 42mm

The ATHENA P5F0770039007B Top End Piston Kit is designed for Yamaha 250 WR-F and YZ-F models from 2008 through 2013. It provides a replacement piston kit for the top-end assembly of the listed applications.

This kit is identified by ATHENA part number P5F0770039007B and is sold as one unit. Verify the vehicle model and model year before ordering to help ensure the part matches the intended application.

Features:

• Brand: ATHENA
• Part Number: P5F0770039007B
• Product Type: Top end piston kit
• Application: Yamaha 250 WR-F / YZ-F
• Model Years: 2008–2013
• Unit of Measure: Each