S&S Cycle SS920-0143 Standard Dome Top Pistons w/11:1 Compression Ratio for Royal Enfield 650 Twins 19-UpThese 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.
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S&S Cycle SS920-0143 Standard Dome Top Pistons w/11:1 Compression Ratio for Royal Enfield 650 Twins 19-Up