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S&S Cycle 99-06 BT 4in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing
S&S Cycle
S&S Cycle

S&S Cycle 99-06 BT 4in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing

$1713.80

On Backorder — Expected to ship by May 7, 2026

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S&S Cycle 99-06 BT 4in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing. Improves engine displacement for more power.

Key Features

  • Fits 1999-2006 Harley-Davidson Big Twin models (non-balanced, except 2006 Dyna).
  • Features a 4-inch stroke for increased engine displacement.
  • Built by S&S Cycle, a well-known name in performance motorcycle engines.
  • Does not include the sprocket shaft bearing race.
  • Designed for custom builds and engine performance upgrades.
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Product Details

When you're looking to build a bigger, more powerful engine for your Harley-Davidson Big Twin, a quality flywheel assembly is key. This 4-inch stroke flywheel assembly from S&S Cycle is built for 1999 through 2006 models that are not factory balanced, offering a solid foundation for increased displacement. It's designed to fit a wide range of Harley-Davidson motorcycles, including popular models like the Road King, Heritage Softail Classic, and Fat Boy, giving you the option to upgrade your ride's performance.

S&S Cycle is well-known for its performance engine components, and this flywheel assembly is no exception. It's constructed to handle the demands of a larger stroke, which translates directly to more cubic inches and, consequently, more torque and horsepower. This assembly does not include the sprocket shaft bearing race, so be sure to have that on hand or source it separately if needed for your rebuild. Proper installation is crucial for the longevity and performance of your engine, so refer to the manufacturer's instructions for the correct procedures.

This flywheel assembly is a significant upgrade for riders seeking to extract more performance from their Big Twin. It's a substantial component that forms the heart of your engine's power delivery. Ensure your specific model falls within the 1999-2006 range and is not a Dyna model from 2006, as these are excluded from fitment. This part is a great choice for custom builds or for those looking to refresh and enhance their existing engine.

Specifications

Brand
S&S Cycle
Manufacturer Part #
320-0403
UPC
320-0403

Frequently Asked Questions

S&S Cycle 99-06 BT 4in Stroke Flywheel Assembly w/o Sprocket Shaft Bearing

$1713.80