Combining a Harley-Davidson engine with a Ducati chassis would result in a custom-built motorcycle that incorporates elements from both brands. This type of customization is often done by motorcycle enthusiasts or custom bike builders who enjoy experimenting with different components to create unique machines.
By using a Harley-Davidson engine, you would likely have a powerful V-twin engine known for its low-end torque and characteristic rumble. On the other hand, the Ducati chassis would offer a sportier and more agile platform, as Ducati is known for its performance-oriented motorcycles and advanced engineering.
The final result would depend on the specific models and components used, as well as the expertise and preferences of the builder. It could potentially combine the best of both worlds, blending the power and sound of a Harley-Davidson engine with the handling and agility of a Ducati chassis. However, it's important to note that combining components from different manufacturers may require modifications and engineering expertise to ensure proper fitment and compatibility.