so i binned my 5inch freestyle quad pretty hard into a concrete barrier last week, broke two props and bent the motor shaft on motor 3. ordered a replacement motor (same spec as the others, 2306 2450kv) and swapped it out, resoldered the pads, seemed fine on the bench.

took it out yesterday and after about 4 minutes of flying i noticed the new motor was significantly hotter than the other three when i landed. like uncomfortably hot to touch, others were just warm. props are balanced, spin direction is correct, didnt see anything in betaflight logs that jumped out at me but i might be missing something. ESC telemetry shows current draw is slightly higher on that corner too.

my first thought was maybe i got a bad motor but wondering if anyone has seen this from a bad solder joint or something with the esc. the ESC itself took a pretty good hit in the crash too, i checked the board visually and didnt see any obvious damage but who knows.

had almost the exact same thing happen after i replaced a motor on my 4in. turned out one of the solder joints on the ESC phase pad was cold ? looked fine visually but wasnt making proper contact so the motor was basically fighting itself. reflow all three pads on that ESC and see if it changes anything. also worth checking if the stator is rubbing at all, bent motor mount or slightly warped frame can cause the bell to drag just enough to heat things up without being obvious.

could also just be a dud motor honestly. ive gotten bad motors straight out of the bag before, QC on some of these cheaper brands is not great. if reflowing the ESC pads doesnt fix it id just swap the motor again before going deeper down the rabbit hole. also double check your prop nut isnt overtightened on that arm, i know it sounds dumb but ive seen it cause weird bearing load issues.