1991–1998 Harley-Davidson Dyna Evolution 1340 (FXDB/FXDC)

The 1991–1998 Harley-Davidson Dyna Evolution 1340 series represents a pivotal chapter in the Motor Company’s history, marking the introduction of a new chassis designed with modern computer-aided design (CAD) technology while retaining the revered Evolution V-twin engine. Launched to bridge the gap between the agile Sportster and the larger Touring models, the Dyna platform offered riders a “big twin” experience in a more performance-oriented and customizable package. These models, beginning with the limited-edition FXDB Sturgis and expanding to include iconic names like the Low Rider and Wide Glide, defined a new generation of factory custom cruisers for Harley-Davidson.

The Dyna chassis was developed as a successor to the acclaimed but complex FXR frame. While the FXR was celebrated for its superb handling, its intricate, triangulated frame was costly and time-consuming to manufacture. Harley-Davidson sought a more streamlined production process without sacrificing the rubber-mounted engine design that isolated the rider from the V-twin’s vibrations. The resulting Dyna frame was simpler, featuring two main rubber engine mounts instead of the FXR’s three-point system. This new design not only reduced production costs but also showcased the engine more prominently, with an under-seat oil tank and an exposed central battery box that harkened back to classic Harley styling.

History and Development

The Dyna story began in 1991 with the introduction of the FXDB Sturgis. Released as a limited-production model, it served as the public’s first look at the all-new chassis. Finished in black with subtle orange accents, the Sturgis was a lean, stripped-down motorcycle that immediately set the tone for the platform’s performance-first ethos. Following its success, Harley-Davidson released another limited edition, the 1992 FXDB Daytona, before launching the first full-production model, the FXDC Dyna Glide Custom, in the same year. The FXDC featured more chrome and polished components, appealing to a broader audience seeking the classic Harley-Davidson look on the new, modern frame.

The platform quickly expanded throughout the early 1990s. 1993 saw the introduction of two models that would become cornerstones of the Harley-Davidson lineup for decades: the FXDL Dyna Low Rider and the FXDWG Dyna Wide Glide. The Low Rider offered a lower seat height and pullback handlebars for a more relaxed riding position, while the Wide Glide delivered a factory “chopper” aesthetic with its raked-out, wide-set front forks, 21-inch spoked front wheel, and bobtail rear fender.

The Evolution Engine: Heart of the Harley-Davidson Dyna Evolution 1340

At the core of these early Dyna models was the 1340cc (80 cubic inch) Evolution engine. Introduced in 1984, the “Evo” was a significant leap forward in reliability and performance over its Shovelhead predecessor. Constructed with aluminum cylinders and heads, it ran cooler, was less prone to oil leaks, and offered a more consistent and durable riding experience.

In the Dyna chassis, the air-cooled, 45-degree V-twin was a perfect match. It delivered the signature low-end torque and visceral character that riders expected from a Harley-Davidson “big twin.” Paired with a 5-speed transmission and a belt final drive, the powertrain provided strong, smooth acceleration ideal for both city cruising and highway touring. The rubber-mounting system of the Dyna frame allowed the engine to shake at idle—a beloved Harley characteristic—but smoothed out significantly at speed, providing a comfortable ride over long distances.

Legacy

The 1991–1998 Dyna models with the Evolution engine successfully established the Dyna family as a third pillar in the Harley-Davidson lineup. They offered a blend of traditional styling, modern engineering, and customizable potential that resonated deeply with riders. This platform became the foundation for the performance-cruiser movement and a favorite canvas for customization for over two decades, cementing its place as a crucial and influential design in the company’s long history.

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Specifications: 1995 Harley-Davidson FXDC Dyna Glide Custom**