I was riding home this evening in the rain when I had "engine trouble". Because of the sudden loss of power and gear noise, I first suspected the planetary reduction gear, but that seemed less likely as I let off the accelerator and coasted on normally. After I pulled over to the side of the road, I tried the accelerator again and ... nothing. The bike didn't even budge.
This seemed a little odd to me because I was getting some acceleration when moving, although much less than normal. On an impulse, I tried again as I pushed the bike forward and the accelerator was working again...sort of. Speed was limited and with the disturbing noises coming from the back hub I wasn't going to go any significant distance. Clearly whatever had occurred has the potential to do even more damage to the motor and reduction gears, so I called for a rescue.
Thinking back to my induction motor theory, I recall that single phase induction motors require a starting circuit to start rotation of the rotor. If this is not done, rotation may be commenced by manually giving a slight turn to the rotor. That seems to be what's occuring now for me, so does that mean I've lost 2 of 3 phases? Is that more likely caused by a loose connection or a blown motor controller (IBGT)?
At this point there's no indication of a problem on the dash. Would the onboard diagnostics even know if an IBGT was blown?
(It's really a pity, since I was just about to roll over 10,000 miles.)