I'm new to the whole go kart thing. Building one for my son.. I almost killed misled on the 1st test drive. Throttle cable doesn't retreat so the thing took off wouldn't stop. Didn't know what to do. Jump, crash, put my feet out and try to stop it that way. Finally chain came off and I was saved. I haven't gotten all my parts which one part is a kill switch. I also have a new throttle cable coming. Just not here yet. Couldn't stop laughing AFTERWARDS.