This PROX piston kit is a high-quality, Japan-manufactured OEM replacement designed to restore performance and reliability in 125cc 2-stroke engines. Made from a high-silicon-content aluminum alloy and CNC-machined to extremely close tolerances, it delivers accurate fitment and consistent operation—ideal when you’re rebuilding a worn top end or doing preventive maintenance.
By replacing the piston and wear components as a complete set, you reduce the risk of poor sealing, loss of compression, and premature engine wear—helping your bike start easier, run cleaner, and pull harder through the rev range.
Key features:
✅ OEM replacement design, manufactured in Japan
✅ High-silicon aluminum alloy cast to meet or exceed OEM specifications
✅ Precision CNC-machining for tight tolerances and proper fit
Benefits of use:
🔹 Reliable top-end refresh with matched components in one kit
🔹 Helps restore compression and performance for consistent power delivery
🔹 Trusted PROX quality for durability under demanding riding conditions
Technical specifications (as provided):
📌 Displacement: 125 cc
📌 Engine type: 2-Stroke
📌 Bore size: 54.00 mm (Standard)
📌 Piston size: 53.97 mm
📌 Skirt coating: Non-coated
📌 Vendor part number: 01.4223.C
Why choose this product?
⭐ Japan-made OEM-replacement quality for dependable rebuilds
⭐ Complete kit (piston, rings, pin, circlips) simplifies ordering and installation
⭐ Precision manufacturing helps ensure correct fit and long service life
