This PROX Piston Kit is designed to restore crisp performance and reliability in your 250cc 4-stroke engine. With precision-machined fitment and a durable, low-expansion alloy, it helps reduce friction and maintain consistent clearances—ideal when you’re rebuilding a top end for dependable power and longevity.
If your bike is showing signs of wear such as loss of compression, harder starting, or reduced throttle response, a quality piston kit is one of the most effective ways to bring the engine back to spec and ride with confidence again.
Key features:
✅ Built for durability and performance with precise machining for optimal fit
✅ Complete top-end piston package: piston, high-performance rings, wrist pin and circlips
✅ Low-expansion, low-friction alloy to support stable operation under heat and load
Benefits of use:
🔹 Reliable refresh for worn top ends to help restore compression and efficiency
🔹 Matched components in one kit simplify ordering and reduce compatibility mistakes
🔹 Consistent clearances for smoother running and longer service life
Technical specifications (where applicable):
📌 Brand: PROX
📌 Vendor part number: 01.4355.B
📌 Engine type: 4-Stroke
📌 Displacement: 250 cc
📌 Bore size: 78.00 mm
📌 Piston size: 77.97 mm
📌 Type: Standard Size B
📌 Compression ratio: 12.5:1
📌 Units: Kit
Why choose this product?
⭐ Proven PROX quality focused on precise fit and dependable engine performance
⭐ A complete kit solution for a cleaner, faster top-end rebuild process
⭐ Great choice for riders who want long-lasting parts and consistent results
