Wossner 8216DA Piston Kit - 1999-2026 Yamaha YZ250 / YZ250X 2-Stroke

Wossner 8216DA Premium Forged 2-Stroke Piston Kit - Standard Size A

Maintain the legendary "hit" of your Yamaha 2-stroke with the Wossner 8216DA Piston Kit. Specifically engineered for the Yamaha YZ250 and the woods-focused YZ250X, this Standard Size A forged kit is the professional choice for restoring Factory Quality power and reliability. At Moto-House MX, we know that the YZ250 engine is one of the most versatile platforms in motocross history, and Wossner’s aerospace-grade components ensure it stays at peak performance on the track or the trail.

Forged from aerospace-grade aluminum alloy, this piston provides superior structural integrity and thermal resistance compared to standard cast pistons. The 8216DA features a permanent skirt coating to reduce internal friction and piston rock, resulting in a quieter engine and smoother throttle response. With optimized machining for lightness and reinforced strength in the crown, this dual-ring piston is built to handle the intense heat and mechanical stress of competitive 250cc racing.

Top Features: Wossner 8216DA Piston Kit

• Standard Size A (66.35mm Piston): Precision-engineered for the standard 66.40mm bore to restore original factory tolerances and compression.
• Aerospace Forged Alloy: Premium aluminum construction provides maximum durability for high-performance 250cc 2-stroke engines.
• Low-Friction Skirt Coating: Permanent coating reduces wear on cylinder walls and ensures a more efficient break-in period.
• Dual-Ring Design: Offers a superior combustion seal and improved heat dissipation for consistent power throughout your moto.
• Complete Assembly: Kit includes the forged piston, high-quality rings, wrist pin, and clips.

Expert Pro-Tip: The Yamaha YZ250 engine has remained a favorite for decades due to its reliability and broad powerband. When installing the 8216DA, always check your cylinder for any signs of glazing or wear in the Nikasil plating. Replacing your small-end wrist pin bearing and using a fresh top-end gasket kit during installation is essential for maintaining the high-RPM reliability Yamaha owners expect.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
1999-2026	Yamaha	YZ250
2016-2026	Yamaha	YZ250X

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 66.35mm piston designed for the standard 66.40mm bore. It is the ideal choice for new cylinders or those in excellent condition with minimal wear.

Q: Will this fit both the YZ250 and the YZ250X?
A: Yes, while the YZ250X has different head volume and power valve timing, it utilizes the same bore size and piston configuration as the standard YZ250 motocross model.

Q: Does this kit include the wrist pin bearing?
A: No, the kit includes the piston, rings, pin, and clips. We highly recommend purchasing a new high-quality small-end bearing separately for every top-end rebuild.

Recommended Pairings

• Top End Gasket Kit: Essential for a professional, leak-free engine rebuild.
• Motorex Cross Power 2T Oil: Premium synthetic lubrication to protect your new forged piston investment.

Restore your Yamaha’s power and precision today. Buy now at Moto-House MX!

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.