Piston Kit

This PROX Piston Kit is a Japan-manufactured OEM-replacement solution for refreshing your 2-stroke 85cc top end with confidence. Built from a high-silicon-content aluminum alloy and CNC-machined to extremely close tolerances, it’s designed to meet or exceed OEM specifications for fit, sealing and long-term reliability. If your engine is losing compression, starting poorly, or showing signs of wear, this kit helps restore crisp response and consistent power.

Key features:

• ✅ OEM-replacement design (Japan-made): built to match original fit and performance.
• ✅ High-silicon cast aluminum alloy: durable material engineered to meet/exceed OEM specs.
• ✅ Complete kit: includes piston, ring kit, wrist pin and circlips for a proper install.

Benefits of use:

• 🔹 Reliable top-end refresh: helps restore compression and dependable running.
• 🔹 Precise machining for better fit: tight tolerances support consistent sealing and performance.
• 🔹 Convenient all-in-one package: essential components included to reduce sourcing mistakes.

Technical specifications:

• 📌 Brand: PROX
• 📌 Vendor part number: 01.4121.C
• 📌 Displacement: 85 cc
• 📌 Engine type: 2-Stroke
• 📌 Bore size: 48.50 mm (Standard)
• 📌 Piston size: 48.47 mm
• 📌 Compression ratio: Standard
• 📌 Skirt coating: Non-coated
• 📌 Units: Kit

Why choose this product?

• ⭐ Built to OEM replacement standards with proven manufacturing quality.
• ⭐ Includes the key wear parts needed for a correct piston replacement.
• ⭐ Great choice for maintenance-driven rebuilds where fit and reliability matter.