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 | 4 Valve Pockets, Forged Piston |
| Bore - Actual | 76.80 mm |
| Bore - Oversize | STD |
| Bore - Standard | 76.80 mm |
| Boss Space In | 20.00 mm |
| Compression Height | 11.00 mm |
| Compression Ratio - Actual | 14.2:1 |
| Country of Origin | USA |
| Cylinders | 1 |
| Displacement | 249.3 cc |
| Dome Coating | None |
| OEM Reference No | 13101-KRN-A40 |
| Piston Head Type | Dome |
| Piston Pin Hole Diameter | 16.00 mm |
| Piston Size | 76.78 mm |
| Skirt Coating | Moly |
| Stroke | 53.80 mm |
| Total Height | 33.20 mm |
| Treatment | None |
