heres a tip i got off a pro get a jug of warm slightly soapy water and connect a battery direct to the motor what you wana do is submerge the motor fully under the water and hold it there for 3mins rince the motor and then change the water this time with no soap and do it again for 2mins.(saturns have internal fans so do splash alittle)
this is what pros do to wear there 540 motors in but also this cleans most of the crud off the com and brushes.when you have done that dry it off and spray the bushings with some gt85 or wd40 make sure you dont get any inside though.
i also get some cotton buds and wet them and press them agains the com and turn it(works best with a pinion on) to get the rest of the crud off.
this should revive the motor and its even made a few of my 540 motors faster if it doenst then its shot.
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