I have a TSDZ2 (36v 250W) with ~2700km on it, or rather had. I was riding my bike yesterday and suddenly the display started flickering and I lost assistance. I stopped and checked the wires and battery status, but they seemed OK. Today I pulled the motor from the bike to check what the problem was, but when I opened it the entire inside of the shell was filled with black sticky oil/grease and the mainboard was ashes. I have cleaned the gear and the inside of the motor in the past, and this part never had any oil/grease in it.
I'm looking to replace this motor with the TSDZ2B, but first I'd like to know if anyone could have a possible cause. I was riding the bike at 20 to 25Kph, set to "s
