ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV, Personal Watercraft, etc.
Coated for ultimate performance
Most of the ProX pistons come with a coating. Our OEM style Tin coated pistons assist the wear in process when you just started the bike. We have developed a new skirt coating that not only assists the wear in process, but also helps reducing friction after the wear in. The black coating is made from a delicate mix of materials and will increase performance.
Product specifications
| Attribute | Value |
|---|
| Additional Info | 5 Valve Pockets, Forged Piston |
| Bore - Actual | 77.00 mm |
| Bore - Oversize | STD |
| Bore - Standard | 77.00 mm |
| Boss Space In | 17.00 mm |
| Compression Height | 14.30 mm |
| Compression Ratio - Actual | 13.5:1 |
| Country of Origin | USA |
| Cylinders | 1 |
| Displacement | 250 cc |
| OEM Reference No | 17D-11631-90 |
| Piston Head Type | Flat with Raised Top |
| Piston Pin Hole Diameter | 16.00 mm |
| Piston Size | 76.97 mm |
| Skirt Coating | - |
| Stroke | 53.60 mm |
| Total Height | 40.40 mm |
