S&S, 865cc big bore kit 11:1

Royal Enfield: 650 Twin models

865cc kit. Increases bore from stock 78mm to 90mm. 865cc kit. Complete kit that includes big bore cylinder sleeves, big bore pistons, rings, wristpins, wristpin clips and a head gasket. Increases compression ratio from stock 9.5:1 to 11:1.