ATHENA P5F0770039007A 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. Designed for riders who demand championship-level performance and long-lasting reliability, this complete rebuild kit combines a precision-forged piston with Athena's premium top-end gasket kit for a seamless installation and dependable results. Manufactured using a reverse extrusion forging process and precision CNC machining, the piston delivers exceptional strength, superior heat resistance, and smooth power delivery, while premium Japanese piston rings and Athena's advanced gasket technology provide outstanding sealing in the most demanding conditions.

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

Includes:

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

• Piston Size: 76.96mm
• Displacement: 250cc
• Compression Ratio: 13.5:1
• Piston Type: Forged
• Skirt Design: Forged Side Relief
• Compression Height: 22.30mm
• Piston Pin: Standard
• Big End Pin Diameter: 16 x 10 x 42mm

The ATHENA P5F0770039007A 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 top-end service on the specified applications.

Built for use with the listed Yamaha models, this kit is suited to maintenance and engine rebuilding work involving the top-end piston assembly. Confirm the vehicle model and model year before ordering to ensure the part matches your application.

This product is supplied as one unit. The ATHENA brand and P5F0770039007A part number provide clear identification for service records, workshop planning, and replacement-part selection.

Features:

• Brand: ATHENA
• Part Number: P5F0770039007A
• Product Type: Top end piston kit
• Application: Yamaha 250 WR-F / YZ-F
• Model Years: 2008–2013
• Unit of Measure: Each