ATHENA P5F0770187009B Top End Piston Kit for Yamaha 250 WR-F / YZ-F 2016–2018

Breathe new life into your 4-stroke enduro engine with Athena's Forged Top End Piston Kit. Designed for riders who demand maximum performance and long-lasting reliability, this complete rebuild kit pairs a precision-forged piston with Athena's premium top-end gasket kit for a seamless installation and race-ready 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 for confidence in every ride.

• Complete top-end rebuild kit featuring a forged 4-stroke piston and premium gasket set
• Reverse-extruded forged aluminum piston for exceptional strength and durability
• Precision CNC-machined for OEM-quality fit and reliable performance
• Premium Japanese piston rings with wear-resistant coatings reduce friction and extend engine life
• Optimized piston design promotes efficient combustion and smooth, consistent power delivery
• Advanced gasket materials provide dependable, leak-free sealing under demanding riding conditions

Includes:

• Forged 4-Stroke Piston
• Piston Rings (2)
• Piston Pin / Wrist Pin
• Circlips
• Complete Top End Gasket Kit

• Piston Size: 76.96mm
• Displacement: 250cc
• Compression: 13.5:1
• Piston Type: Forged
• Compression Height: 20.20mm
• Piston Pin: Standard
• Big End Pin Diameter: 16 x 9.5 x 38mm

The ATHENA P5F0770187009B Top End Piston Kit is designed for Yamaha 250 WR-F and YZ-F models from 2016 through 2018. It provides a replacement piston kit for the engine’s top-end assembly.

This kit is identified by part number P5F0770187009B and is supplied as one unit. Its application-specific design supports straightforward parts identification when servicing a compatible Yamaha 250 WR-F or YZ-F engine.

Choose the ATHENA Top End Piston Kit when replacing the piston in a 2016–2018 Yamaha 250 WR-F or YZ-F. Verify the vehicle application and part number before ordering to ensure the kit matches the intended service requirement.

Features:

• Brand: ATHENA
• Part Number: P5F0770187009B
• Product Type: Top end piston kit
• Application: Yamaha 250 WR-F / YZ-F
• Model Years: 2016–2018
• Unit of Measure: Each