Piston Kit

Restore crisp power and reliable compression with this PROX piston kit, manufactured in Japan as a high-quality OEM replacement. The piston is cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances for consistent fit and durability. It’s an ideal choice when your top end needs a refresh and you want dependable performance ride after ride.

This kit helps solve common 2-stroke wear issues such as loss of compression, harder starting, and reduced throttle response by replacing the key components as a matched set—so you can rebuild with confidence and get back on track or trail faster.

Key features:

• ✅ Made in Japan, OEM-replacement design for dependable fit and performance
• ✅ High-silicon aluminum alloy + CNC machining to meet or exceed OEM tolerances
• ✅ Complete kit includes piston, ring set, wrist pin and circlips

Benefits of use:

• 🔹 Reliable compression and power to bring back strong 2-stroke performance
• 🔹 Reduced friction and wear thanks to the moly-coated piston skirt
• 🔹 Faster, simpler top-end service with all essential parts in one kit

Technical specifications:

• 📌 Brand: PROX
• 📌 Engine type: 2-Stroke
• 📌 Displacement: 250 cc
• 📌 Bore size: 66.40 mm
• 📌 Piston size: 66.37 mm
• 📌 Oversize: Standard
• 📌 Type: Standard Size D
• 📌 Skirt coating: Moly coated
• 📌 Vendor part number: 01.6343.D

Why choose this product/service?

• ⭐ Built to OEM-replacement standards with tight machining tolerances
• ⭐ Complete kit contents help ensure a correct, reliable rebuild
• ⭐ Great option for routine top-end maintenance on 250cc 2-stroke engines