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It would be very expensive to replace if the frame or the engine get damaged. FYI, many motorcycles, if not all, have the engine directly bolted to the frame. The main downside I can see is the vibrations.


You're not going to be able to weld the block to the frame, due to the block (likely) being cast. You can bolt it with solid motor mounts, which are commercially available for more common performance engines.


Noise and vibration are the two biggies for the downside. Most serious races have their engines solid mounted to the frame. The motor mounts are just there to make it more comfortable for the driver. If you aren't worried about comfort, solid mount is the way to go. I'm sure you have to go around and tighten things once in a while as well. Vibration has a ...

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