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Upgrade your Harley-Davidson Big Twin engine with the S&S Cycle Flywheel Assembly designed specifically for 124" engines from 1984 to 1999. Crafted from heat-treated, closed die steel forgings, this assembly offers exceptional strength, being 114% stronger than late-model stock flywheels. The assembly is fully balanced and meticulously trued to less than 0.0005 inches runout on the pinion and sprocket shaft bearing surfaces, enabling higher RPM capabilities and smoother operation. The flywheel features a three-piece design with forged pinion and sprocket shafts, with the only joints where a 1.671-inch diameter connecting rod crankpin is pressed into the flywheels, ensuring structural integrity and durability. The left-side flywheel includes a notch for crank position sensor compatibility, providing seamless integration with modern ignition systems. Fully assembled with heavy-duty 7.667-inch connecting rods that have full-width wrist pin ends, this assembly is engineered to handle the increased power of a stroked engine, balanced for stock bore and 3-5/8 inch stroker pistons. Whether you're rebuilding or upgrading your engine, this flywheel assembly delivers reliable performance and longevity for high-performance applications.
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