ATHENA P4F0664267019A Top End Piston Kit for Yamaha 250 YZ 1999–2023

Breathe new life into your 2-stroke engine with Athena's Forged Top End Piston Kit. Designed for riders who demand maximum strength and reliability, this complete rebuild kit pairs a precision-forged piston with Athena's premium top-end gasket kit for exceptional performance on the track or trail. Forged from a high-performance aluminum alloy and precision CNC machined, the piston offers superior durability, improved heat resistance, and consistent power delivery, while Athena's advanced gasket technology ensures a dependable, leak-free seal every time.

• Complete top-end rebuild kit featuring a forged 2-stroke piston and premium gasket set
• Forged high-performance aluminum piston for maximum strength and durability
• Precision CNC-machined for OEM-quality fit and reliable performance
• Optimized piston profile promotes efficient combustion and smooth power delivery
• Premium piston rings provide excellent cylinder sealing while minimizing friction
• Advanced gasket materials deliver long-lasting sealing under demanding riding conditions

Includes:

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

• Piston Size: 66.34mm
• Displacement: 250cc
• Compression: Standard
• Piston Head: Domed
• Piston Type: Forged
• Piston Pin: Biconical
• Big End Pin Diameter: 18 x 13 x 53mm

The ATHENA P4F0664267019A Top End Piston Kit is designed for Yamaha 250 YZ models from 1999 through 2023. This kit is identified as a top-end piston kit for the specified Yamaha application.

Built around the ATHENA brand and part number P4F0664267019A, this replacement component is intended for use when servicing the top end of a compatible Yamaha 250 YZ motorcycle. Confirm application details before ordering to ensure the kit matches the model and model year.

The product is supplied as one unit, as indicated by the listed unit of measure. Use the part number to verify suitability with the motorcycle manufacturer’s service information and the requirements of the repair.

Features:

• Brand: ATHENA
• Part Number: P4F0664267019A
• Product Type: Top end piston kit
• Application: Yamaha 250 YZ
• Model Years: 1999–2023
• Unit of Measure: Each