For my second project, I originally wanted to upgrade a Bladez XTR 450 (see pic). I procured 3 of them (in pretty bad shape) for around $60 on Craigslist. Decided to clean a couple of them up before deciding what to do.
I was thinking of overvolting the existing motor using lithium batteries, but after testing the 24v motor with 36v sla's, it overheated too much. After receiving some advice from zen_racer I decided to go with a Boma bldc 1500w motor. He also suggested I get a Kelly controller or Golden Motor controller. Rhyoo suggested I go with two Multistar 16000mah 6s lipos.
After purchasing the batteries and motor, I realized the Boma was going to be a pita to mount to the frame, and the lipos were too big for the battery box. Not only that, but I felt this thing was going to be pretty fast and powerful, so having only one brake and no suspension was going to be a problem. So I decided to switch strategies and see what other platform I can find that was more robust for my system. I found a Super 1000w scooter used on Craigslist for $300. It's the typical Chinese scooter, but it had what I needed: dual disk brakes, dual suspension, plenty of room for my lipos, and a spot for my Boma to drop right in. I figured it was a pretty good deal since it was fully functional and it also had an extra battery pack, so I pulled the trigger.
This is where the real journey begins. I was able to do some side jobs and earn enough money for a full upgrade including motor, lipos, charger and ps, and the controller. I have already begun my project, but I thought I'd take some time and periodically post updates so others who want to do a similar project can learn from my experience. Everything I've learned so far has come from hundreds of hours of research over a couple years. I hope others can find this thread both enjoyable and edifying.
Here are the main specs:
Super 1000 watt electric scooter 36v frame (dual disk brakes, front/rear suspension)
48v, 1500w, 4300 rpm Boma brushless inrunner motor (rpm's for Boma motors are often overstated, so taken with a grain of salt)
Kelly brushless KBS48121X mini controller
Two Multistar 6s lipo batteries (12c) wired in series for 12s (44.4v min.)