Ugh. Friggin cheap chinese crap. At least the cheap chinese crap to replace it is also cheap in price.
I have 2 of these HobbyFans now and it's the best I tried so far:
[MEDIA=amazon]B0B17NM4ML[/MEDIA]
I also have this Injora:
[MEDIA=amazon]B09XMN5MPH[/MEDIA]
The Hobbyfans ones are a little faster than stock and have great low speed control and torque. The Injora is a little slower than stock and has even better low speed control and torque. Also, the Hobbyfans one has the correct screw orientation, so you don't have to swap out the motor plate.
For the Hobbyfans one on a JLU, all I had to do was trim the battery tray leg at the back of the motor. First cut was below the little step in the face, but that was too low, so go a little bit above the step where the red line is in this pic and should be good to go.
[ATTACH=full]382950[/ATTACH]
I think the Injora is similar, but its been a while since I did it, so it might be a little bigger. I just cut the leg off on that one I think.