S&S, 73-99 4-1/4" stroke flywheel assembly




Un-assembled and un-balanced flywheels only, sold in pairs. 1989 model year, so these fit all 73-99 models. Must be used with S&S sprocket shaft. OEM 8-1/2″ diameter to match OEM flywheel scrapers. Note sprocket shaft: OEM sprocket shafts will not fit the 6° taper that S&S flywheels have, apart from 81-85 stock style B.T sprocket shafts (OEM 23909-80 / MCS 502615 and 502616). These will fit S&S flywheels but do not have the keyway that S&S sprockets shafts have. The woodruff key eliminates spinning of the sprocket shaft in the left flywheel. Note pinion shaft: Stock 81-86 type replacement pinion shafts can be used on these S&S flywheels, but S&S pinon shaft assemblies (use 81-86 model year) are offered as well. Note crankpin: Stock 81-99 replacement Big Twin crankpins can be used, but S&S crankpins (use 81-99 model year) are offered as well. Note oil pump: For 90-99 models, with stock 3-piece flywheels with non-removable sprocket & pinion shafts, it is required to use pre-90 pinion shaft parts when converting to any (early) 5-piece flywheels assembly. S&S offers these parts as a ’90-99 Pinion Shaft Conversion Kit’. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required.



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