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 | S&S 650 HC Kit | |
| Bore X Stroke | 78 x 67.8mm | 78 x 67.mm |
| Compression Ratio | 9.5:1 | 11.0:1 |
DISCLAIMER:
FOR CLOSED COURSE COMPETITION USE ONLY. NOT INTENDED FOR STREET USE. LEGAL IN CALIFORNIA ONLY FOR RACING VEHICLES WHICH MAY NEVER BE USED, OR REGISTERED OR LICENSED FOR USE, UPON A HIGHWAY.
510-0708-installation-instructions-for-s-s-big-bore-kits-for-royal-enfield.pdf
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