S&S CYCLE EVOLUTION 4.25" STROKER FLYWHEEL ASSEMBLY HARLEY DAVIDSON harley handlebars more progressive engagement

more progressive engagement

18 mm O2 Bungs with 12 mm adapters

CHOOSE YOUR FIT IN OPTIONS

CNC-machined aluminum

GEL SEATING - NO BACKREST

S&S CYCLE EVOLUTION 4.25" STROKER FLYWHEEL ASSEMBLY HARLEY DAVIDSON harley handlebars more progressive engagementS&S CYCLE EVOLUTION 4. 25" STROKER FLYWHEEL ASSEMBLY Made of high strength forged steel and designed for stock and high performance custom applications Special keyed 6 large diameter tapered sprocket shaft that provides more contact area for increased strength Standard S&S tapered crankpin and pinion shaft are used for ease of service 8 1 2" diameter with 4 1 4" or 4 5 8" stroke Kits come fully assembled, trued and balanced to stock H D 80" or 96"