Re: hello all, from Kentucky
Greetings from Southern Ohio
That torque bar is quite interesting. I'm guessing that since most motorized bikes kits in the past have had 50cc or less in mind to be copliant with many of the states laws here, and affordability in their country of origin (where grown men often weigh less than 110 lbs) that there hadn't been too much of a problem with frame stress vectors. But looking at what you have makes perfect sense to me.
Alot of guys here are wanting larger motors and they would be wise to consider the structures they are installing them in. Afterall these bikes were designed to be human powered. The vibration of a motor mounted directly on welded tubing should bear watching for cracks with occasional inspections.
Welcome to the board Shiloh0 !