Yeah the slow boat from china just got slower. Burning up motors is deffinetely not normal at least with what im doing. I think its due to the trucks weight, 4wd and nitro engine sized spur gear. I started with an 18 tooth that cooked an armature, then tried a 23 tooth that melted the brush holder, then a 15 tooth that ran awesome but melted another brush holder so im going to try a 10 tooth pinion next. The original nitro engine had a 10 tooth on it. The truck with the 15t pinion was really fast and handled the best the truck ever has.