I was out on my maiden voyage on my xb 500 and was at full speed going down hill and heard a few clunks from the rear hub and lost power and the rear was dragging until i coasted to a stop. When i got home i checked the 30amp fuse and it was blown. I tried to put a new one in and it sparked and melted the contact on the fuse. I then unplugged the battery pack and installed the fuse and then plugged in the battery pack, dont ask why... and the rear wheel jerked a bit and i saw some smoke and smelled burning and popped the fuse again. Is the motor done? Thanks guys.
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Also since i am pretty sure the motor is toast, is there an upgrade i should go to at this point to get more power out of the scooter? I checked xtream's site and they want 195 for the motor i need i believe its the 1/2 inch axle version.
OUCH! My guess is that regen in a "high speed" decent (>24 MPH) melted some connector.
I'd try a sniff test. Is the controller box burned smelling? How about the hubmotor?
Next would be resistance checks. Something is shorting, which will show up with a VOM very quickly, though isolating exactly where the break is may take a while. Unplug things and slowly re-assemble, using the wiring diagram to predict the effect. Remember that your scoot may not be wired precisely the same as the diagram, thanks both to PO's and the relaxed Chinese manufacturing system.
Check the wiring VERY carefully; the brass electrical connections these scoots use are prone to corrosion > resistance > heat > melting > shorting. There are 5 + 3 wires going to the hub motor from the controller. See:
http://visforvoltage.org/forum/7914-regular-connector-inspections-yall
Mark