I wonder if we can bore that out to 650?

And there is a nice sized space for a tiny turbo just forward of the cylinder then maybe it will have 26 H/P. Just rip out that boat anchor and put a severely modified Savage engine in it. It does have a vintage look to it but the tank most likely doesn't have a adequate capacity.

As the sign says;  Indian Motorcycles, Smoking Harleys since 1901