Never seen a rotor like this b4

[Serpents811]

i pulled the rotor of my 3674 2200kv leopard since its not working and this is what i found , now the motor doesnt smell burn or looks burn

[tagasagwan]

Well, since it doesn't look or smell burnt. Maybe the bearings got busted that caused the rotor to wobble and scratch the wire windings and killed the motor. The clearance between the rotor and wires is less than a millimeter. Well, just my 2cents. I could be wrong! I'm sure somebody will chime in to give a better theory.

[Serpents811]

Well, since it doesn't look or smell burnt. Maybe the bearings got busted that caused the rotor to wobble and scratch the wire windings and killed the motor. The clearance between the rotor and wires is less than a millimeter. Well, just my 2cents. I could be wrong! I'm sure somebody will chime in to give a better theory.

good point , i will check the main bearing even thou i was using a thrust bearing

[ray schrauwen]

Looks rusty too. Did your boat get wet at some time?

What rpm were you running it at or what voltage???

I just took apart an 1800 3674 and replaced the bearings because buddy swamped his Geico.

Inside the magnets had rust on them. It took some time with WD40, motor cleaner and a toothbrush to get the rust out.

If he left the rust in there and the fouled bearings, eventually the motor would heat up and with the very small air gap in a 3674 and then his rotor would look like yours too according to my best guess.

[Serpents811]

I did take a look at the bearings and they are good with no sign of stress , also this motor was never dunk in water , this came out of a old rigger I had , at the time the esc failed I'm assuming taking the motor with it or by versa