Genius...Would love too see the inside engineering of the SL/XL 70/75 engine. Tim
I'd love to see the outside welding on the cases
.
I'm guessing, but I think the lower barrel is as per normal and the upper barrel has been added. Probably by cutting up another set of cases and welding in the appropriate bits to the cases.
That probably would have been easy compared to machining a new crank
.