While it is technically possible to create a custom sportbike using an old Harley-Davidson engine, it would require significant modifications and fabrication work. Harley-Davidson engines are typically designed for cruiser-style motorcycles, characterized by their low-end torque and relaxed riding positions. However, sportbikes are known for their high-revving engines, lightweight frames, aggressive riding positions, and aerodynamic designs.
Converting an old Harley-Davidson engine for use in a sportbike would involve substantial changes and adaptations to various components, including:
Frame: Sportbikes have a specific frame design optimized for handling and aerodynamics. You would likely need to fabricate or modify a frame to accommodate the Harley-Davidson engine and achieve the desired sportbike characteristics.
Suspension: Sportbikes typically have more aggressive suspension setups, including inverted forks and rear mono-shocks, designed to handle high-speed cornering and maneuverability. Adapting or retrofitting the suspension components to fit the frame and work with the Harley-Davidson engine would be necessary.
Weight reduction: Sportbikes prioritize lightweight construction to enhance performance and agility. To create a sportbike out of an old Harley-Davidson engine, you would need to strip away unnecessary weight from the motorcycle, including components not required for a sportbike setup.
Ergonomics: Sportbikes have a distinct riding position with forward-leaning ergonomics and rear-set foot pegs. Adapting the controls, handlebars, and foot controls to achieve the desired sportbike riding position would be necessary.
Performance enhancements: Harley-Davidson engines, while powerful, are not typically designed for high-revving performance found in sportbikes. Achieving sportbike-level performance would require significant modifications to the engine, including changes to the intake, exhaust, camshaft, and fueling system.
Converting an old Harley-Davidson engine into a sportbike would be a complex and time-consuming project, requiring a high level of engineering expertise, fabrication skills, and access to specialized tools. It's worth noting that there are already a wide range of sportbike options available on the market, designed and manufactured specifically for high-performance riding.