PISTON KIT 99-25 YZ250 66.40 C, PROX 01.2321.C RM250 03-12
Piston kit with 66.40mm bore. Piston size is 66.37mm. ProX pistons are precision machined on CNC equipment using the same low-expansion, low-friction piston alloy as major Japanese engine manufacturers. This kit is a high-quality replacement for original pistons in motorcycles, scooters, mopeds, ATVs, and personal watercraft. Many ProX pistons feature an OEM style tin coating to assist break-in and a new skirt coating that reduces friction after break-in, increasing performance. Part number PROX 01.2321.C. Manufacturer: Pro-X Racing. Weight: 294g.
- SKU
- 56-W742.C.PX
- Brand
- Pro-X Racing
- Availability
- In Stock (1)
FULL DESCRIPTION
ProX Piston Kit - 66.40mm Bore
This ProX Piston Kit is engineered for high performance and durability, offering a premium solution to replace your original piston. Precision machined using state-of-the-art CNC equipment, this kit utilizes the same low-expansion, low-friction piston alloy favored by major Japanese engine manufacturers.
Key Features:
- Bore Size: 66.40mm
- Piston Size: 66.37mm
- Constructed with a high-quality, low-expansion, low-friction piston alloy.
- Features advanced skirt coating for improved performance and reduced friction after the break-in period.
- Designed to assist the wear-in process, especially with the OEM style Tin coating.
- Manufactured by Pro-X Racing, a trusted name in high-performance engine components.


