S&S CYCLE 100" CARBURETED BILLET ENGINE FOR 1986-2003 SPORTSTER AND
1996-2002 BUELL HARLEY-DAVIDSON MOTORCYCLES (NATURAL ALUMINUM FINISH)


S&S Cycle engines are designed to fit Harley's with no modifications.

  • S&S SB100 engines come assembled with a natural aluminum finish. Crankcases have 1986-1990 four-speed style cam geometry and 1991-2003 five-speed style drive side. Primary and transmission components not included. S&S motor 31-9891 is for 1986-2003 Harley-Davidson Sportster models. S&S motor 31-9893 is for 1996-2002 Harley-Davidson Buell models.

    Features and benefits include:
    • Square motor configuration (equal bore and stroke) produces excellent torque, greatly increases engine life, and reduces mechanical engine noise
    • S&S Super G carburetor with teardrop air cleaner
    • S&S high flow Super Stock cylinder heads
    • S&S 600 camshaft
    • S&S forged pistons, 10.3:1 compression ratio
    • Adjustable pushrods and pushrod cover assemblies
    • Hydraulic tappets and S&S forged roller rocker arms
    • S&S billet gear cover kit and billet aluminum rocker covers
    • Includes oil pump and oil filter mount
    • One year warranty