Wossner 8220DB Piston Kit - KTM 125 SX/XC Husqvarna TC125 Beta 125 RR Gas Gas MC 125 Size B

Wossner 8220DB Premium Forged 2-Stroke Piston Kit - Size B

Keep your 125cc engine at peak performance with the Wossner 8220DB Piston Kit. Specifically engineered for modern European 2-strokes including KTM, Husqvarna, Beta, and Gas Gas, this Size B forged kit is the professional choice for restoring "Factory Quality" power in seasoned cylinders. At Moto-House MX, we know that small-bore engines require precise tolerances to maintain high-RPM reliability; Wossner’s aerospace-grade forged components provide the exact fitment needed to keep your machine in the hunt.

Forged from aerospace-grade aluminum alloy, the 8220DB offers superior structural integrity and thermal resistance compared to standard cast pistons. This kit features a permanent skirt coating to minimize internal friction and piston rock, resulting in a quieter engine and smoother power delivery. This Size B piston (53.96mm) is designed for cylinders with a 54.01mm bore, making it the ideal selection for cylinders that have seen standard operational wear and need to regain perfect piston-to-wall clearance.

Top Features: Wossner 8220DB Piston Kit

• Size B (53.96mm): Precision-engineered for 54.01mm bores to maintain factory-spec tolerances in cylinders with slight wear.
• Aerospace Forged Alloy: Premium aluminum construction built to withstand the extreme mechanical stress and heat of 125cc racing.
• Low-Friction Skirt Coating: Permanent coating reduces wear on cylinder walls and ensures a more efficient break-in period.
• Single-Ring Performance: Optimized for reduced drag and maximum high-RPM efficiency in competitive 2-stroke applications.
• Complete Assembly: Kit includes the forged piston, high-performance ring, wrist pin, and clips.

Expert Pro-Tip: In the 125cc class, the piston is a critical maintenance item. Size B is the preferred choice for a top-end refresh when your cylinder is still in good condition but has worn slightly beyond the ideal clearance for a Size A piston. When installing the 8220DB, always replace your small-end wrist pin bearing and check your power valve for carbon buildup. Using a fresh top-end gasket kit is essential for maintaining the primary compression needed for maximum throttle response.

Fitment List

Brand	Models	Year Range
KTM	125 SX / XC / XC-W / EXC / Six Days	2001-2022
Husqvarna	TC125 / TE125 / TX 125 / Heritage	2014-2025
Beta	125 RR / Race Edition / X-Pro	2018-2026
Gas Gas	MC 125	2021-2025
Husaberg	TE125	2012-2014

Frequently Asked Questions

Q: What is the difference between Size A and Size B?
A: Size B (53.96mm) is exactly 0.01mm larger than Size A. This slight increase is designed to compensate for the natural, microscopic wear that occurs on a cylinder wall over time, restoring the engine to original factory performance levels.

Q: Why choose a forged piston for racing?
A: Forged pistons are denser and significantly stronger than cast pistons. In high-revving 125cc engines, a forged piston provides better resistance to the mechanical stresses that can cause standard pistons to crack or fail under pressure.

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

Recommended Pairings

• Top End Gasket Kit: Required for a professional, leak-free engine rebuild.
• Motorex Cross Power 2T Oil: Premium synthetic protection specifically formulated for high-performance 2-stroke race engines.

Restore your machine’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.