Hi, I have a Bafang rear hub motor SWX02 with a Bafang controller and the c961 lcd. The motor is 250W 36V and I have a 11.6ah battery pack. A couple of weeks ago the speed sensor failed, there was no signal coming from the motor. I opened up the controller and installed an external speed sensor. The problem is that the motor feels weaker somehow. The peak torque is somewhat lower, and the walk assist function is almost useless. I had an old kt controller and lcd lying around and tried replacing the bafang one. Seems like the walk assist packs a bit more punch, but degrades quickly after running for 10 seconds or so. Is this normal? I wanted to replace the controller completely to test the motor on a normal trip, but I can't seem to get the motor running from the kt controller other than by using the walk assist function. Connecting the PAS sensor (the original one) does not start the motor. I don't have a throttle to experiment with, but I connected a 1K potentiometer to the KT throttle cable and I am able to pass 0-4.5V through the signal cable, there is a little spinning square in the lcd on the 1-4V range, then I get error 1 at the top voltage. I assume the error is normal, but I am worried the motor won't start. P1 is set to 87 and P3 to 1. The controller is sensorless so I am only using 3 cables to the motor. My questions are: 1 - does this seem a motor or controller issue? 2 - anything I can do to hook up the KT controller + lcd? 3 - suggestions for motor alternatives? I was considering changing to a mid motor, keeping the 36V battery. Something like a Bafang 8FUN BBS02 500w 36V. I would link to the pswpower.com item but the site seems to be down. There is also the size of the chainring to consider. I'm not sure I have enough clearance to install the mod drive either. The bike I have: https://www.cargobike.se/produkt/cargobike-classic-electric/ . It's 50kg, I usually ride it (I'm 90kg) with two kids on the front (about 40kg extra). Hilly area, I don't mind pedalling, but could use more power than the current 250W. The bike should not go faster than 30km/h.