Wossner 8303DC Piston Kit - 2018-2021 Sherco 125 SE-R SC Standard Size C

Wossner 8303DC Standard Series Forged 2-Stroke Piston Kit - Standard Size C

Extend the life and performance of your Sherco engine with the Wossner 8303DC Piston Kit. Specifically engineered for the 2018-2021 Sherco 125 SE-R and SC models, the "Size C" forged kit is the professional solution for cylinders that have logged high hours. At Moto-House MX, we know that technical enduro riding puts unique stresses on small-bore engines; this +0.02mm Size C kit provides the precise fitment needed to restore compression and eliminate power loss in bores that have naturally expanded from use.

Forged from high-performance aerospace aluminum alloy, the 8303DC is significantly more resilient to thermal stress than stock cast pistons. It features a dual-ring configuration, providing a superior seal and enhanced heat dissipation—essential for keeping your Sherco cool and powerful during slow-speed technical climbs or high-RPM transfer sections. To ensure maximum longevity, Wossner applies a permanent molybdenum disulphide skirt coating that reduces friction and prevents piston rock. Precision-machined for 54.02mm bores, this 53.95mm piston kit lets you keep your Sherco at the front of the pack.

Top Features: Wossner 8303DC Piston Kit

• Standard Size C (53.95mm): Precision-machined for 54.02mm bores to compensate for moderate cylinder wear and restore factory-correct tolerances.
• Dual Ring Configuration: Delivers an exceptional secondary seal and improved cooling, ensuring consistent power delivery in extreme off-road conditions.
• Aerospace-Grade Forging: Denser and stronger than OEM alternatives, offering increased resistance to fatigue and high-heat expansion.
• Low-Friction Skirt Coating: Permanent molybdenum disulphide treatment reduces internal drag for a quieter, smoother running engine and extended cylinder life.
• Optimized Lightness: Expertly machined to shed unnecessary weight while maintaining structural integrity for lightning-fast throttle response.
• Complete Assembly: Includes the forged Size C piston, performance rings, wrist pin, and circlips.

Expert Pro-Tip: Sherco 125 engines are high-performance machines that require tight tolerances for peak torque. If your cylinder has seen significant trail time and measures beyond the original factory Size A or B specs, moving to a Wossner Size C (53.95mm) is the expert way to restore your compression without a full replating service. 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 premium 2-stroke oil to protect your forged assembly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2018-2021	Sherco	125 SE-R Racing
2019	Sherco	125 SC
2018	Sherco	125 SE-R

Frequently Asked Questions

Q: When is it time to move to a Size C piston?
A: Size C (53.95mm) is typically used when your cylinder bore has worn slightly larger (to 54.02mm). This larger diameter ensures you maintain the correct piston-to-wall clearance, preventing "piston slap" and maintaining maximum horsepower.

Q: Does this kit fit the Sherco 125 SC cross-country model?
A: Yes, this kit is fully compatible with the 125 SC, 125 SE-R Racing, and the standard SE-R models within the specified years.

Q: Why choose forged over cast for enduro riding?
A: Forged pistons are much stronger and more resistant to cracking under the high temperatures and fluctuating loads common in technical enduro riding.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a perfect seal and maintain correct engine timing with fresh gaskets.
• Motul 800 2T Factory Line: High-performance lubricant to keep your new forged piston protected in high-stress 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.