The Rusty Butcher Sportster is a top choice for racers and custom bike enthusiasts, renowned for its blend of racing capabilities and customization potential. In this article, we explore a modified version of the Sportster tailored for high-performance racing.
Stock Features and Modifications
The Rusty Butcher Sportster is a popular choice for racers, offering both a stock version and a customizable option for those looking to enhance performance. This particular model retains its stock frame, which may be due to the tedious nature of modifications or because the unaltered frame suits racing needs. A top-end S&S 1250cc kit powers the bike, with key motor modifications including fueling cams, S&S heads, Beehive Valve Springs, and lifters.
Suspension and Wheels
The Sportster’s suspension is outfitted with 43mm R6 top-line tubes, providing stability and control on the track. The wheels are equipped with 19/19 sun rims, laced to stock hubs and spool for reliable performance. The throttle is a Biltwell Whiskey, providing precise control for the rider. The Vortex Racing 7/8 bars and Weiss Racing risers ensure an optimal riding position for maximum maneuverability during races.
Fuel Tank and Seating
The bike’s tank is a custom Omars Fiberglass Knight Frame replica, while the Biltwell cafe seat enhances both comfort and style. For a better grip, Cyca Pro bend handguards are used, ensuring better handling during intense rides.
Gearing, Exhaust, and Shocks
The gearing remains stock, as it performs well in racing conditions, with a Lowbrow chain drive system. The exhaust system features a Cone Eng. 2 into 1 pipe, optimizing engine performance. The Lowbrow Tsunami Fender and FOX 14.25 Podium rear shocks complete the setup, contributing to the bike’s high-performance capabilities.
Additional Modifications
The S&S Teardrop Air Cleaner provides enhanced airflow, while Brembo calipers and Lyndall Racing rotors ensure powerful braking. The Dynatek Electronics ignition system and Biltwell Norman Footpegs round out the modifications, ensuring smooth performance and rider comfort.
Customizable Features
One area where customization is frequently applied is the number plate. Riders can choose their preferred design, and in this case, Maier was selected. The 19-inch Dunlop DT2 soft compound tires and Rusty Butcher’s own sprocket cover complete the aesthetic and performance upgrades.
Sources
- S&S Cycle - Performance Parts Catalog - Manufacturer specifications for the S&S 1250cc kit, teardrop air cleaner, heads, and cams referenced in this build
- Biltwell Inc. - Motorcycle Parts and Accessories - Manufacturer of the Whiskey throttle, cafe seat, and Norman footpegs used on this Sportster build
- Lowbrow Customs - DIY Motorcycle Parts - Source for the chain drive system, Tsunami fender, and other custom components
For the wider Harley-Davidson story - every engine generation from the V-twin to the Milwaukee-Eight, every model line, every era - see our Harley-Davidson history guide.
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