S&S™ COMPLETE 91CI AND 100CI SB-SERIES ENGINES
S&S™ complete SB-Series engines 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 the same as a stock Sportster or Buell engine, 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 a stock Sportster or Buell engine. 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 to complete these engines. Installation of a 100CI SB-Series engine in a Buell frame also requires the purchase of a ZPN 750502 billet motor mount.

S&S™ SB-Series engines include:

• S&S™ Special Application Sportster or Buell style crankcases
• 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
• S&S™ Ignition System