Wossner 8923DA Piston Kit - KTM 250 SX-F/XC-F Husqvarna FC250 Gas Gas MC 250F

Wossner 8923DA Premium Series Forged 4-Stroke Piston Kit - Standard Size A

Take your small-bore racing machine to the next level with the Wossner 8923DA Piston Kit. Engineered for the high-revving KTM, Husqvarna, and Gas Gas 250cc 4-stroke platforms, this Premium Series forged kit is designed to deliver maximum power and high-compression reliability. At Moto-House MX, we specialize in "Factory Quality" components that allow your engine to breathe and perform at its absolute limit on the motocross track or cross-country course.

Forged from aerospace-grade aluminum alloy, the 8923DA features a high 14.4:1 compression ratio for instant throttle response and increased torque. This piston includes advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—critical for engines that consistently operate near the 14,000 RPM mark. The permanent skirt coating reduces internal friction and piston rock, ensuring a quieter engine and a more efficient break-in period.

Top Features: Wossner 8923DA Piston Kit

• Standard Size A (77.96mm Piston): Precision-engineered for 78.00mm bores to restore original factory tolerances and peak performance.
• 14.4:1 High Compression: Optimized dome design increases compression for significant gains in power across the RPM range.
• Premium Series Forging: Aerospace-grade aluminum construction provides the structural integrity needed for professional-level racing.
• Advanced Lubrication Design: Radial boss machining and annular grooves ensure the wrist pin stays lubricated under extreme thermal loads.
• Low-Friction Skirt Coating: Permanent coating protects cylinder walls and minimizes mechanical drag.
• Complete Kit: Includes forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The modern 250cc 4-stroke engine is a precision instrument. When installing a high-compression forged piston like the 8923DA, it is vital to ensure your valve train and cam chain are in perfect condition. We strongly recommend using high-octane fuel to complement the 14.4:1 ratio and replacing your top-end gasket set and cam chain tensioner during the rebuild to ensure long-term reliability.

Fitment List

Brand	Models	Year Range
KTM	250 SX-F / XC-F / Troy Lee Designs	2016-2022
Husqvarna	FC250	2016-2022
Gas Gas	MC 250F / EX 250F	2021-2023

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 77.96mm piston designed for the standard 78.00mm bore. It is the ideal choice for cylinders that are within factory wear limits.

Q: Do I need to run race fuel with this piston?
A: With a 14.4:1 compression ratio, we highly recommend using high-quality 98+ octane pump gas or a race fuel blend to prevent detonation and ensure peak performance.

Q: Does this kit include gaskets?
A: No, the kit includes the forged piston, rings, wrist pin, and locks. A top-end gasket kit is sold separately and is required for a professional reassembly.

Recommended Pairings

• Top End Gasket Kit: Essential for a professional, leak-free engine rebuild.
• Motorex Cross Power 4T Oil: Premium synthetic lubrication to protect your high-performance engine.

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.