Wossner 8303DC Piston Kit - KTM Husqvarna Gas Gas 350 SX-F FC350 MC350F Size C

Wossner 8303DC Standard Series Forged Piston Kit - Standard Size C

Maintain the high-performance edge of your 350cc powerhouse with the Wossner 8303DC Piston Kit. Precision-engineered for the KTM, Husqvarna, and Gas Gas 350 range, this "Size C" forged kit is the professional choice for riders performing a top-end refresh on cylinders with high hours of operation. At Moto-House MX, we know the 350cc platform is celebrated for its perfect balance of 250-style agility and 450-class power; Wossner’s aerospace-grade forged construction ensures your engine remains reliable while sustaining the high compression ratios these machines demand.

Forged from high-performance aluminum alloy, the 8303DC utilizes a dual-ring configuration designed to maximize cylinder sealing and heat transfer. This is particularly critical for the 350cc engines which frequently operate at high RPMs. To ensure maximum service life and reduced internal drag, Wossner applies a permanent molybdenum disulphide skirt coating that minimizes friction and prevents piston rock. Precision-machined for 54.02mm bores, this 53.95mm Size C piston allows you to restore factory-spec clearances in cylinders that have experienced moderate wear.

Top Features: Wossner 8303DC Piston Kit

• Standard Size C (53.95mm): Engineered for 54.02mm bores to compensate for cylinder wear and restore peak engine compression.
• High Compression Performance: Designed to support compression ratios up to 14.2:1 (depending on model year), ensuring your bike retains its explosive power delivery.
• Aerospace-Grade Forging: Offers superior strength and resistance to thermal fatigue compared to cast alternatives, making it ideal for competitive motocross and off-road use.
• Low-Friction Skirt Coating: Features a permanent skirt treatment that reduces drag and protects the cylinder wall for a quieter, smoother-running engine.
• Optimized Lightness: Precision machining sheds unnecessary weight while maintaining structural integrity in critical areas like the crown and skirt.
• Complete Kit: Includes the high-performance forged Size C piston, rings, wrist pin, and clips.

Expert Pro-Tip: The KTM/Husky/Gas Gas 350cc engine is a precision instrument. If your cylinder has seen significant track time and measures slightly beyond the factory Size A or B specs, the Wossner Size C (53.95mm) is the correct choice to restore the tight piston-to-wall clearance necessary for maximum horsepower. Always use a precision bore gauge to confirm your cylinder measures 54.02mm before installation. For a professional-grade rebuild, always install with a fresh top-end gasket kit and utilize premium oil to protect your forged assembly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2011-2022	KTM	350 SX-F
2012-2022	KTM	350 XC-F
2014-2022	Husqvarna	FC350
2017-2022	Husqvarna	FX350
2021-2023	Gas Gas	EX 350F
2022-2023	Gas Gas	MC 350F

Frequently Asked Questions

Q: When should I choose Size C?
A: Size C (53.95mm) is slightly larger than Size A or B. It is used when the cylinder bore has worn larger due to high hours, allowing you to maintain the necessary seal for peak compression without needing a new cylinder or replate immediately.

Q: How does this affect my compression ratio?
A: This piston is designed to maintain or slightly enhance factory compression. For most 2020-2022 models, the compression ratio will be 14.2:1, providing excellent throttle response and bottom-end torque.

Q: Will this fit the Kailub Russell Edition XC-F?
A: Yes, this kit is compatible with the 2022 KTM 350 XC-F Kailub Russell edition as well as the standard XC-F and SX-F models.

Recommended Pairings

• Complete Top End Gasket Set: Vital for ensuring a leak-free rebuild and maintaining correct squish heights.
• Premium Synthetic Oil: High-performance lubricant to ensure your new forged piston stays protected under extreme racing conditions.

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.