So been running my 17.5 in 2wd buggy blinky and had no problems keeping up with everyone at the track, then this week all the sudden my car would not clear the back big jump. Nothing changed on anything. I tried gearing up 2 tooth. back down from original 2 tooth. no luck. I switched batteries too. So last resort I swapped out to a loaner motor. Brand "x" was nuts! So much I wanted to buy it from the guy. So my question is do I buy a new rotor and try it or get a whole new motor?