I am looking forward to using the new motor as well. I can tell you that the performance of the GT50 R is *incredible*. It's like a small motorcycle.....it's way more performance then I actually need. I'm betting this thing would hit 40 mph after it's broken in.
I won't be the guy trying to hit 40 mph.....20-25 mph is as fast as I like to go.
The smaller motor is going on my light weight Schwinn aluminum disc hardtail. I just gotta save up the cash for one of Duane's chain drive rear mount kits.
If some's good...more is better and too much ain't enough.