PISTON KIT 99-25 YZ250 66.40 A, PROX 01.2321.A RM250 03-12
ProX piston kit with 66.40mm bore. This kit features a low-expansion, low-friction piston alloy, the same used by major Japanese engine manufacturers. ProX pistons are precision machined on CNC equipment. This piston kit is a first-class replacement for the original piston in your Motorcycle, Scooter, Moped, ATV, or Personal Watercraft. Coated for ultimate performance, the OEM style Tin coating assists the wear-in process, and a new skirt coating reduces friction after wear-in, increasing performance. Includes piston size: 66.35mm. Manufacturer part number: 01.2321.A. Weight: 296g.
- SKU
- 56-W742.A.PX
- Brand
- Pro-X Racing
- Availability
- In Stock (1)
FULL DESCRIPTION
ProX Piston Kit 66.40mm Bore
This ProX Piston Kit is engineered for optimal performance and durability. Featuring a 66.40mm bore and a 66.35mm piston size, this kit is crafted using state-of-the-art CNC equipment. The alloy used is the same low-expansion, low-friction material favored by major Japanese engine manufacturers, ensuring a high-quality replacement for your original piston.
Key Features:
- Precision machined using advanced CNC equipment.
- Utilizes a low-expansion, low-friction piston alloy.
- Designed as a premium replacement for original pistons.
- Includes advanced skirt coating to aid the initial wear-in process and reduce friction.
- Coating is a proprietary blend designed to enhance performance.
This ProX piston kit offers a first-class solution for various powersports applications, enhancing both the break-in period and long-term running efficiency of your engine.


