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S&S COMPLETE 91CI AND 100CI ENGINES FOR SPORTSTER OR BUELL
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S&S COMPLETE 91CI AND 100CI ENGINES FOR SPORTSTER OR BUELL

S&S complete Engines for Sportsters and Buells are available in 91CI (1.490 cc) and 100CI" (1640 cc). The 91CI engines have 3 5/8" stroke with a 4" bore. Cylinder length is stock so the engine fits in all frames with little or no modification. Compression ratio of the 91CI engine is 9.5:1. The 100CI engine has 4" stroke with a 4" bore. Cylinder length is .260" taller than stock. The 100CI engine will generally fit in stock Sportster frames with no modification, but due to the increased cylinder length, requires the S&S billet motor mount to fit in the Buell chassis. Exhaust modifications may also be required to gain frame clearance when installing a 100CI engine in a Buell frame. Compression ratio of the 100" engine is 10.3:1. Crankcases have 1986 thru 1990 four-speed style cam geometry, 1991 to present five-speed style driveside, and are available only assembled by S&S technicians in natural aluminum finish. You need a 1991 to present style 5-speed transmission, clutch, primary components, 1986 to present style OEM or aftermarket oil pump, 1986 thru 1987 style bolt-on oil filter mount, charging system, and ignition system to complete these engines. Installation of a 100CI Buell style engine in a Buell frame also requires the purchase of a PN 750502 billet motor mount.S&S Sportster and Buell engines include: S&S Special Application Sportster or Buell style crank cases. Complete S&S flywheel assembly. S&S Super Stock cylinder heads. S&S cylinders and pistons. S&S 555 camshaft set and required gear case components. Adjustable pushrods and pushrod cover assemblies. S&S billet tappet guides with hydraulic tappets. Super G carburetor kit. S&S gear billet XL style cover kit. S&S billet aluminum rocker covers and roller rocker arms

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