- Shipping to all Europe
| Size | Stock | Date |
|---|---|---|
| A - Ø66.35MM | Estimated shipping on Date : 2026-11-20 | 2026-11-20 |
| B - Ø66.36MM | Estimated shipping on Date : 2026-11-20 | 2026-11-20 |
| C - Ø66.37MM | Estimated shipping on Date : 2026-11-20 | 2026-11-20 |
| D - Ø66.38MM | Estimated shipping on Date : 2026-11-20 | 2026-11-20 |
PROX Piston Yamaha YZ 250 / Suzuki RM 250 1999-2027
The PROX Racing Parts piston is designed for the maintenance and rebuilding of 2-stroke motocross engines, combining wear resistance, dimensional stability and reliability under demanding riding conditions.
PROX cast pistons are manufactured from an aluminum alloy using a gravity-casting process, with approximately 18% silicon content. This composition helps reduce thermal expansion and maintain precise operating clearances between the piston and cylinder.
The silicon content also supports piston skirt wear resistance and operation in cast-iron or nickel-silicon-coated cylinder bores. PROX additionally develops specific skirt coatings, surface treatments and lubrication solutions, with availability depending on the individual piston part number.
- Brand: PROX Racing Parts
- Type: 2-stroke engine piston
- Material used in PROX cast pistons: aluminum alloy
- Manufacturing process: gravity casting
- Approximate silicon content: 18%
- Low thermal expansion characteristics
- Designed for wear resistance and dimensional stability
- Skirt coating, anodizing and lubrication holes: dependent on the specific part number
- Piston diameter, size grade and included components not specified
- Enables piston replacement during engine rebuilding
- Helps maintain stable operating clearances
- Reduces thermal expansion through the alloy composition
- Supports piston skirt wear resistance
- Contributes to engine top-end durability
- Construction developed for the demands of 2-stroke motocross engines
Important: Verify the part number, piston diameter and size grade before installation. Follow the manufacturer's recommended clearances, break-in procedures and lubrication requirements. Consult the compatibility table below to confirm the applicable motorcycle models and years.
Stock Status Indicators:
🟢 Green – Item is in stock and available for immediate delivery.
🟡 Yellow – Item is in stock at the supplier. Please check the estimated shipping date.
🔴 Red – Item is out of stock.
