In theory, it might be possible to modify a KTM Duke to fit a Royal Enfield Bullet engine, but it would be an extensive and challenging customization project. There are several important factors to consider:
Compatibility: The KTM Duke and Royal Enfield Bullet are built by different manufacturers with different engineering designs and specifications. Their engines, frames, and other components are not designed to be interchangeable. Modifying the KTM Duke to accommodate a Royal Enfield Bullet engine would likely require significant modifications to the frame, mounting points, electrical systems, and various other components.
Engine Mounting: The mounting points and dimensions of the Royal Enfield Bullet engine are likely to be different from those of the KTM Duke. Adapting the Bullet engine to fit into the Duke's frame would require custom fabrication work, which could be complex and time-consuming.
Electronics and Wiring: The electrical systems and wiring harnesses of the KTM Duke and Royal Enfield Bullet will be different. Integrating the Bullet engine into the Duke would involve rewiring and adapting the electrical systems to ensure compatibility and functionality.
Performance and Handling: The KTM Duke and Royal Enfield Bullet have different engine characteristics, power outputs, and weight distributions. Swapping the engines may have a significant impact on the motorcycle's performance, handling, and overall dynamics. It's important to consider whether the modified motorcycle would still be safe and enjoyable to ride.
Legal and Registration Considerations: Modifying a motorcycle's engine to fit a different make or model can have legal implications. In many jurisdictions, significant modifications like engine swaps require specific certifications, inspections, and approvals to ensure compliance with safety and emissions regulations. Failure to meet these requirements could result in legal issues or difficulties in registering the modified motorcycle.
Overall, while it might be technically possible to fit a Royal Enfield Bullet engine into a KTM Duke, it would be an extensive and challenging modification that may not be practical or advisable for most riders. It's essential to carefully consider the technical, legal, and safety aspects before attempting such a customization project.