If its not the bearing and turns out to be a bad roto start instead, dont waste money on parts for the roto start just send it back to HPI.. My rotostart crapped out after a year and they told me to send it back no questions asked and sent me a brand new complete rotostart including all the backing plate parts . So if I get another truck thats not converted yet I can convert it over to rotostart no problem. I keep the original pull start in my toolbox just in case it craps out again though..