Here's why:
* Engine Size and Mounting Points: The Dragstar 650 engine is significantly larger and heavier than the Dragstar 125 engine. The mounting points on the frame and the engine itself are not compatible.
* Transmission and Swingarm: The Dragstar 650 utilizes a different transmission and swingarm than the Dragstar 125. These components are designed for the specific size and power of the respective engines.
Possible Solutions (But Difficult):
* Extensive Modifications: While it's theoretically possible to swap in the 650 engine, it would require extensive modifications to the frame, swingarm, transmission, wiring, and other components. This would be a major project and likely not cost-effective.
* Custom Build: You could potentially build a custom frame and chassis to accommodate the 650 engine, but this would essentially be starting from scratch and is a very complex undertaking.
Recommendation:
If you're looking for more power in your Dragstar 125, it's generally a much more practical and cost-effective solution to consider a larger displacement motorcycle.
Remember, swapping engines between different motorcycle models is a very challenging and potentially unsafe project. It's best to consult with a qualified motorcycle mechanic before attempting any significant modifications.
