4" Bore Cylinder and Piston Kit for S&S<sup>®</sup> SB100 Engine for 1986-'03 HD<sup>®</sup> Sportster<sup>®</sup> and 1994-'02 Buell<sup>®</sup> Models - Natural Aluminum Finish
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4" Bore Cylinder and Piston Kit for S&S® SB100 Engine for 1986-'03 HD® Sportster® and 1994-'02 Buell® Models - Natural Aluminum Finish

Item #: 91-3031
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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.

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100" engines for Sportster models typically use heads with 76cc chambers for high compression and 85cc chambers for low compression.