This replacement cylinder and piston kit for S&S SB100 engines contains a set of S&S 4" bore cylinders, S&S 4" bore forged flat topped pistons with rings and wristpins, head gaskets, base gaskets, and exhaust gaskets.
Cylinders are machined with the S&S bolt pattern and are intended for S&S crankcases and cylinder heads. Compression ratio depends on the combustion chamber of the cylinder heads used. S&S 85cc heads produce 9.6:1 compression and S&S 76cc heads increase the compression to 10.3:1.
100" engines for Sportster models typically use heads with 76cc chambers for high compression and 85cc chambers for low compression.