High-Compression 11:1 Piston Kit for Royal Enfield® 650 TwinsThese 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
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High-Compression 11:1 Piston Kit for Royal Enfield® 650 Twins