Wossner 8174DB Piston Kit - KTM 125 SX/XC Husqvarna TC125 Beta 125 RR Gas Gas MC 125 Size B

Wossner 8174DB Premium Forged 2-Stroke Piston Kit - Size B

Maintain the high-revving performance of your European 125cc engine with the Wossner 8174DB Piston Kit. Specifically engineered for a wide range of racing and off-road machines including KTM, Husqvarna, Beta, and Gas Gas, this Size B kit is the professional choice for restoring Factory Quality power in seasoned cylinders. At Moto-House MX, we provide the precision-forged components necessary to keep small-bore 2-strokes running at peak efficiency under demanding track and trail conditions.

Forged from aerospace-grade aluminum alloy, this piston provides superior structural integrity and heat resistance compared to standard cast alternatives. The 8174DB features a permanent skirt coating to minimize friction and piston rock, ensuring a quieter engine and smoother throttle response. This Size B piston (53.96mm) is designed for cylinders with a 54.01mm bore, providing the precise clearances needed for optimal performance in cylinders that have seen standard use.

Top Features: Wossner 8174DB Piston Kit

• Standard Size B (53.96mm): Precision-engineered for 54.01mm bores to maintain perfect tolerances in used cylinders.
• Aerospace Forged Alloy: High-strength aluminum construction designed for maximum durability in high-revving 2-stroke engines.
• Low-Friction Skirt Coating: Permanent coating reduces wear on the cylinder walls and ensures a more efficient break-in period.
• Dual-Ring Design: Provides an excellent combustion seal and improved heat transfer for consistent power delivery.
• Complete Assembly: Kit includes the forged piston, high-quality rings, wrist pin, and clips.

Expert Pro-Tip: The 125cc class demands frequent top-end maintenance to stay competitive. Size B is the ideal choice for a cylinder that has been through a few racing seasons, as it compensates for the natural microscopic wear of the Nikasil plating. When installing the 8174DB, always check your cylinder for any signs of glazing. Replacing your small-end wrist pin bearing and using a fresh top-end gasket kit during installation is highly recommended to ensure long-term reliability.

Fitment List

Brand	Models	Year Range
KTM	125 SX / XC / XC-W / EXC	2001-2022
Husqvarna	TC125 / TE125 / TX 125	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 allows you to maintain the factory-specified piston-to-wall clearance as the cylinder wall experiences natural wear over time, preventing power loss and ensuring long-term reliability.

Q: What is the benefit of a forged piston over a cast one?
A: Forged pistons are much stronger and more resistant to the stresses of high heat and high RPM, making them less likely to fail during intense racing compared to cast pistons.

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 small-end bearing separately for every top-end rebuild.

Recommended Pairings

• Top End Gasket Kit: Essential for a professional, leak-free engine rebuild with a fresh set of gaskets.
• High-Quality 2-Stroke Premix Oil: Maintain your new piston with premium lubrication designed for high-performance 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.