Piston Kit for 4 Stroke

High-performance 4-stroke piston kit for a cleaner, quieter and more efficient top-end rebuild. The WOSSNER Premium Series piston kit is engineered to improve lubrication at the wrist pin, reduce friction during break-in, and maintain strong ring seal for consistent performance. With a lightweight forged design and tight piston wall clearance, it helps the engine run smoother while supporting demanding riding conditions.

This kit is ideal when you want a complete, correctly-matched set of components for a top-end service—saving time, reducing guesswork, and restoring compression and reliability.

Key features:

• ✅ Enhanced wrist pin lubrication (piston pin oiling slots, radial boss machining and annular grooves)
• ✅ Coated piston skirt to reduce friction and improve break-in performance
• ✅ Ring land treatment to improve ring seal and oil control

Benefits of use:

• 🔹 Quieter running engine thanks to lightweight piston design and tight wall clearance
• 🔹 Better durability and efficiency from improved oiling and reduced friction surfaces
• 🔹 Easy top-end rebuild: matched components supplied together in one kit

Technical specifications (as provided):

• 📌 Engine type: 4-Stroke
• 📌 Bore size: 77.00 mm (oversize: Standard)
• 📌 Piston size: 76.96 mm
• 📌 Compression ratio: 14.0:1
• 📌 Material: Forged aluminum alloy
• 📌 Stroke length: 53.60 mm
• 📌 Style: Standard Size A

What’s included:

• Piston #8957DA
• Ring Set #RIK77.00D
• Wrist Pin #WP070-SP
• Retaining Clips #CW16

Why choose this product?

• ⭐ Premium forged construction designed for demanding 4-stroke engines
• ⭐ Complete kit (piston + rings + pin + clips) for a correct, hassle-free rebuild
• ⭐ Designed to support strong sealing and controlled lubrication for reliable performance