Are you dautless on the scooter forum talking about LA and hills and a 650?
I guess you mean here on ES, can't think of what post you might mean. I got my 350w Currie so that I could park miles away in L.A., a common occurrance, but around Hollywood, North Hollywood, etc. it's hilly with narrow roads and traffic; this thing just wasn't doing me a lot of good. I do live some 30 miles from those neighborhoods in Orange County, but my own neighborhood is hilly and the 350w can't get me home. I used to have a 650w that was better but not good enough.
Just so you know, I have 2-750w 24v that I need to make time for. One is the direct drive rear and I want to try it with both the stock controller at 36v and with the Currie 36v, (1000w) just to see how it does. The 350w wasn't impressed with 36v feeding it, even when I did the shunt mod with some extra on the wire loop inside the controller that is supposed to carry some extra juice. The problem might have been that adding 10% to that weak little thing didn't mean much. When I get the 36v controller I'll try it out there, too. I might also yank the controller off my 650w Razor dirtbike. A kid put up a YouTube video where he put an adapter and a 7.4 volt RC battery on hanging from the side with the stock 36v batteries and it's faster. But there's no space for more fullsize batteries to go 48v proper.
The other 750w is a chain drive; I want to tear it apart as a donor and make a trail bike out of a beach cruiser. So would it do better with that Currie 36v, or with a YK43B? http://www.ebay.com/itm/24V-36V-500W-48 ... ce&vxp=mtr
That one might overwhelm any motor you have, but the 500w will be a bit sterner than the 350w.
I know people put the RC motors on those scooters, but that's an experiment in itself for a better platform than no suspension and little braking will be. A controller to run it will cost hundreds anyway.