I'll skip the story about it and just say I found myself with the parts to a complete third motorized bicycle kit. So I picked up an old Roadmaster "SomethingOrOther" at a garage sale and stripped it down and painted it. I replaced all the worn out parts and the handlebars to make motorbike number three. Pictures are below. Because the tires are narrower, it's a rougher ride on the dirt alley than the other bikes. The handlebars are a little narrow too but are easy enough to adapt to. All in all it runs pretty well.
This bike will likely find it's way to Craig's list.