Wossner 8906DA Piston Kit - 2014-2018 Sherco 300 SEF SEF-R Standard Size A

Wossner 8906DA Standard Series Forged 4-Stroke Piston Kit - Standard Size A

Maintain the precision and power of your Sherco enduro machine with the Wossner 8906DA Piston Kit. Engineered specifically for the 2014-2018 Sherco 300 SEF and SEF-R, this Standard Size A forged kit is the premier choice for riders performing a top-end refresh. At Moto-House MX, we understand that high-performance European 4-strokes require tight tolerances and superior lubrication to handle technical enduro trails; Wossner’s advanced forging process delivers a piston that is both lighter and stronger than cast alternatives, ensuring your Sherco remains as responsive as the day it was built.

The 8906DA is packed with performance-driven features, including enhanced piston pin oiling slots and radial boss machining designed to optimize wrist pin lubrication. To ensure maximum efficiency and longevity, Wossner utilizes a special ring land treatment for improved oil control and a tighter ring seal. The skirt is treated with a permanent coating that reduces internal friction and protects the cylinder wall during the critical break-in period. Precision-machined for 84.00mm bores, this 83.94mm piston kit maintains your factory compression ratio while providing the structural integrity needed for aggressive off-road riding.

Top Features: Wossner 8906DA Piston Kit

• Standard Size A (83.94mm): Precision-engineered for factory 84.00mm bores to provide the tightest possible piston-to-wall clearance for a quiet, efficient engine.
• Advanced Lubrication: Features enhanced oiling slots and annular grooves to ensure the wrist pin stays lubricated under high-load enduro conditions.
• Aerospace-Grade Forging: Manufactured from a high-silicon aluminum alloy for superior strength and heat resistance compared to OEM cast pistons.
• Low-Friction Skirt Coating: Permanent coating reduces drag, minimizes wear, and ensures a smoother break-in and quieter operation.
• Improved Ring Seal: Specialized ring land treatment optimizes oil control and compression sealing for consistent power delivery.
• Complete Rebuild Kit: Includes the forged Size A piston, performance rings, wrist pin, and circlips.

Expert Pro-Tip: The Sherco 300 SEF-R is a highly tuned machine that rewards precise maintenance. When performing your top-end rebuild, always ensure your cylinder is measured with a precision bore gauge. Size A is the ideal choice for new or low-hour cylinders that still meet factory 84.00mm specifications. For a professional-grade installation, always use a fresh top-end gasket kit and premium synthetic oil to protect your new forged assembly. Checking your valve clearances at the same time as your piston swap is highly recommended to ensure overall engine health.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2014-2018	Sherco	300 SEF-R Racing
2014-2018	Sherco	300 SEF

Frequently Asked Questions

Q: Does this piston change my engine's compression?
A: No, the 8906DA is designed to maintain the OEM compression ratio, ensuring your Sherco retains its original engine characteristics and fuel requirements while gaining the durability of a forged piston.

Q: Is a forged piston better for enduro than a cast one?
A: Yes. Enduro riding involves high heat and varying loads. Forged pistons are much denser and stronger, making them far less likely to fail or crack under the extreme thermal stress found in technical off-road environments.

Q: What is the benefit of the skirt coating?
A: The coating acts as a dry lubricant layer between the piston and the cylinder wall. This significantly reduces friction during the initial start-up and helps prevent scuffing if the engine is pushed hard before reaching full operating temperature.

Recommended Pairings

• Complete Top End Gasket Set: Essential for maintaining a perfect seal and correct squish heights during your rebuild.
• Premium 4-Stroke Synthetic Oil: High-performance lubricant to ensure your new forged piston and valvetrain stay protected.

Restore your machine’s power and precision today. Buy now at Moto-House MX!

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