I use break cleaner - it'll evaporate long before it ever causes an fire trouble.
But - I also like to scrape out the area between the copper pads on the commutator. (if you've got it all apart anyways).
Those little slots usually get filled with non-conductive crud - but sometimes when something goes wrong in a motor like that, it can kick up a lot of copper dust and that also gets packed in there.
Just use a toothpick or something to clean the grooves so you're sure that each "pad" is electrically isolated.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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