S&S Cycle Royal Enfield 650 Twin High-Compression 11 To 1 Piston Kit
These high compression pistons feature a 7cc raised dome to achieve a compression ratio of 11:1 (from 9.5:1). Higher compression is a key factor in increasing performance.
- Stock Bore X Stroke = 78 x 67.8mm, S&S 650 HC Kit = 78 x 67.mm
- Stock Compression Ratio = 9.5:1, S&S 650 HC Kit = 11.0:1
