they just need to be cleaned every 4 races i use motor cleaner but i put a bit of gold cup paint ball oil in them and my run just find and i had them for about a year now.
cyclone s 8900K motor 30 A esc off brand
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xbxrival 4wd tour car skyline body stock
duratrax evader ext 6600kv motor, eZrun 60A SL ESC
vintage traxxas hawk 11t custom motor, 30A blaster ESC