When it comes to custom Harley-Davidson FXR builds, few shops push boundaries quite like Feuling Parts. For Sturgis 2025, the team took a well-worn FXRT and transformed it into a high-performance twin-carb twin-cam machine that blends cutting-edge engineering with timeless Harley style.

Led by Feuling’s own Luke Leatherman, the project started with an aging, nearly stock FXR purchased in tired condition. Rather than a simple restoration, the team set out to reimagine the FXRT platform with modern performance, premium components, and extensive fabrication work. The result is a one-of-a-kind motorcycle that made waves at the Sturgis Motorcycle Rally 2025, showcasing Feuling’s deep expertise in V-twin performance innovation.

One of the most striking aspects of the build is its twin-cam engine conversion. Unlike Dyna models, the FXR’s unique oil bag placement makes this swap far from straightforward. Feuling engineered custom conversion cases and modified the intake manifolds and inner primary case to make everything fit.

The engine itself is no ordinary twin cam. Feuling outfitted it with their W3 cylinder heads, a 594 race series cam chest, and dual carburetors to maximize airflow and output. To handle the FXR’s limited oil capacity, the team installed a Jag oil cooler with custom lines, ensuring reliable cooling under heavy load.

Perhaps the most unconventional decision was to run two front cylinder heads. This rare setup directs both exhaust ports forward, dramatically reducing heat buildup around the rider while optimizing airflow across the headers. The unique design not only improves performance but also creates a symmetrical left-right layout: carburetors and intake on the left, exhaust on the right. The result is both visually balanced and mechanically efficient—a bike with “two beautiful sides” instead of one.

Beyond the motor, Feuling carefully curated top-shelf parts throughout the build:

• Suspension: A mix of Legend and GP suspension for improved handling and long-haul comfort.
• Clutch: Barnett setup to handle the torque.
• Brakes: Aasado master cylinders paired with Bitchin calipers and oversized rotors deliver stopping power to match the motor’s grunt.
• Tires: Bridgestone rubber for dependable grip.
• Controls & Comfort: Thrashin Supply foot controls, a Satleman seat, and high-bend handlebars with 6.5-inch pullbacks create an ergonomic, long-distance-friendly cockpit. The addition of a Thrashin bar bag adds practical storage for essentials—ideal for a rally bike.

From an engineering standpoint, the Feuling FXRT is a masterclass in solving the challenges of adapting a modern performance engine into a vintage chassis. From oiling system modifications to intake and exhaust redesign, the build demonstrates what’s possible when technical precision meets creative vision.

But it’s not all about numbers and parts. The balanced symmetry of intake and exhaust, the use of custom fabrication to preserve the FXR’s lines, and the attention to comfort all point to a philosophy that a motorcycle should perform as good as it looks—and this one does both in spades.

Unveiled at Sturgis 2025, the Feuling FXRT stood as proof that the Harley-Davidson FXR platform still offers limitless potential for builders who are willing to innovate. With its aggressive twin-cam setup, balanced design, and premium componentry, the bike represents a bold rethinking of Harley’s legendary chassis.

For FXR purists, it’s a reminder that these bikes continue to serve as the ultimate canvas for custom performance builds. And for Feuling Parts, it’s another notch in their long-running legacy of pushing Harley-Davidson motorcycles to new heights.