Piston Kit

Bring back crisp compression and dependable performance with the PROX Piston Kit—an OEM-replacement top-end solution manufactured in Japan for riders who want precise fitment and long-lasting reliability. The piston is cast from a high-silicon-content aluminum alloy and then CNC-machined to extremely close tolerances, helping your 300cc 2-stroke run smoothly after a rebuild.

If your bike has lost power, become harder to start, or you’re simply doing scheduled top-end maintenance, this complete kit makes the job easier by including the critical components you need in one box—so you can focus on getting back on the track or trail with confidence.

Key features:

• ✅ Japan-made OEM replacement designed to match original specifications
• ✅ High-silicon aluminum alloy construction to meet or exceed OEM requirements
• ✅ Complete rebuild set: piston, ring kit, wrist pin and circlips included

Benefits of use:

• 🔹 Restores engine performance by renewing top-end sealing and compression
• 🔹 Reliable fitment thanks to CNC machining and close tolerances
• 🔹 Convenient and time-saving kit format reduces sourcing of individual parts

Technical specifications:

• 📌 Brand: PROX
• 📌 Vendor part number: 01.6394.C
• 📌 Engine type: 2-Stroke
• 📌 Displacement: 300 cc
• 📌 Bore size: 72.00 mm (Standard)
• 📌 Piston size: 71.96 mm (Standard Size C)
• 📌 Material: Aluminum alloy
• 📌 Skirt coating: Non-coated
• 📌 Units: Kit

Why choose this product?

• ⭐ Built to OEM replacement standards for confident servicing
• ⭐ High-quality materials and manufacturing for consistent results
• ⭐ Complete kit content helps ensure a correct, hassle-free top-end rebuild