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I used to be real big into rc car racing. You will always get a particular smell from your motor, you will always get arking as well, to take your motor apart if the com is really in bad shape, you could take it to a hobby shop and get it turned for 10 bucks. also about using brake clean to clean your motor, brake clean leaves a residue, only use electric motor cleaner. and put a drop of oil on each bushing once in a while.
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