This standard bore kit includes a cylinder, piston, and gaskets for the CRF250R model from 2004-2007 with a size of 78mm/12.9. It is a 4-stroke engine type and comes with a 1-year manufacturer warranty. The item is brand new, unused, unopened, and undamaged, and is still in its original packaging. The packaging is the same as what you would find in a retail store unless the manufacturer packaged it in non-retail packaging such as an unprinted box or plastic bag. Please refer to the seller's listing for full details.                                                                                                                      1X Piston Ring Kit

Piston

Bore

78mm

Compression Ratio

12.9:1

Displacement

250cc

Piston Diameter

77.96mm