4 Stroke Piston Kit

Restore crisp 4-stroke performance with a forged piston kit built for racing-level reliability. This Wössner 4-Stroke Piston Kit is designed and manufactured in-house using Wössner’s own forging operation, delivering a lightweight, precise piston that supports tight piston-to-wall clearances for a quieter-running engine. It’s an ideal choice when you’re refreshing a worn top end or building a dependable performance replacement for motocross and off-road use.

Thanks to the moly-coated skirt, friction is reduced during operation and the break-in process is smoother—helping your engine run efficiently while maintaining durability under load. With all key installation parts included, this kit also simplifies your rebuild by keeping critical components matched and ready for assembly.

Key features:

• ✅ In-house designed and manufactured forged piston (Wössner forging operation)
• ✅ Double-bridged forging design for 4-stroke applications
• ✅ Moly-coated skirt to reduce friction and assist break-in

Benefits of use:

• 🔹 Quieter engine operation thanks to tight piston-wall clearances
• 🔹 Reliable performance replacement quality trusted by top Supercross/Arenacross/MXGP teams
• 🔹 Faster, easier rebuild: core parts included in one matched kit

Technical specifications:

• 📌 Brand: Wössner
• 📌 Vendor Part Number: 8816DB
• 📌 Engine type: 4-Stroke
• 📌 Piston diameter: 76.97 mm
• 📌 Piston size: Standard Size B (Bore: Standard)
• 📌 Compression ratio: 14.2:1
• 📌 Skirt coating: Moly coated
• 📌 Stroke length: 53.60 mm
• 📌 Type/Style: Replacement forged piston / Performance replacement
• 📌 Kit contents: piston, ring(s), wrist pin, pin locks

Why choose this product?

• ⭐ Forged performance quality engineered for demanding 4T use
• ⭐ Complete kit format helps ensure correct, compatible rebuild parts
• ⭐ A proven brand widely used in professional motocross racing