No, it is not possible to directly replace the head of a KTM Duke motorcycle with the head from a Duke 1290. The Duke 1290 features a larger engine with different specifications compared to the standard Duke models. The head of the motorcycle contains critical components such as the cylinder head, valves, and camshaft, which are specifically designed and calibrated for the corresponding engine configuration.
Swapping the head from a Duke 1290 onto a lower displacement Duke model would likely result in compatibility issues, such as mismatched parts, different compression ratios, and variations in fuel and air delivery systems. These differences could lead to poor engine performance, mechanical issues, and potentially unsafe riding conditions.
If you are looking to modify your KTM Duke, it is advisable to consult with experts or professional mechanics who specialize in motorcycle modifications. They can provide guidance on suitable upgrades or modifications that are compatible with your specific Duke model.