Having burned out & replaced the OEM motor on my Eagle 50, I decided to dissect the fried motor, like I once did as a kid with toasted electric toys.

The wire armature windings are surprisingly stout & didn't short out on my motor. The brushes really are carbon - little bitty things that don't appear to be built for the long haul. Nevertheless, when the motor blew, it bent one of the brush arms so it no longer contacted to commutator. A little reconfiguration and reassembly & it appears to now run at full RPM's again ... for now.

But Wait, There's MORE:

EVERYONE who has the OEM Exceer RK-370SD motor with the yellow label on the motor body: Go look at your motor & see how the Marketing/Inventory/some dumb pencil pusher decided to design and apply the yellow label - it covers the ventilation slot on one side of the motor body. The motor has a little fan built into the armature which draws in air at one end of the case, & out the other end. They clumsily managed to cover up one of the cooling slots with the stupid yellow sticker - replacewment motors don't have this problem.

Your mission, in order to improve air flow thru your motor, is to yank out the motor & cut the portion of label covering the cooling slot.

I'll wager it adds more life to your motor