Kepler said:A few minor adjustments needed...
Thanks for the tips. I pulled the motor up to just touch the tyre and that worked. I also added a spacer washer to the top locking screw - as this increased the screw's shaft diameter enough to stop the motor rising up so far it scraped on the bottom of the kickstand plate. Both the top and bottom locking screws are at the end of their travel arcs as this bike has a 120mm distance between the centre of the bottom bracket and the tyre surface (technically 10mm over your specified limit for the drive unit). Pic below.
Anyway, I've just been on my maiden voyage and it's pretty exhilarating I don't have a speedometer but I reckon I was getting up to 20mph on a flat surface without peddling. It sailed up the local gentle hills at full throttle. Noise-wise (in FOC mode), the motor very quietly whistles at low throttle and then the sound changes to a considerably louder and lower-toned electric vehicle whir when the motor bites up into the tyre - this was loud enough for people to look across as I passed them. I don't know if further tweaking will quieten it down - I hope so. On some throttle twists, something happens to cause a grinding noise (a bit like the mashing of gears in a car), and I'd like to resolve that. The Vesc (contained in the Lithuanian alu box) got hot but not too hot to touch.
It's a great bit of kit and good fun to ride. I did about a mile on it and would have stayed out longer but I went over a bump and my saddlebag containing the battery flew off and was left dangling on a wire by the back wheel ...pit-stop time.