Hi I just recently got a 1983 Honda atc 185s. Friend gave it to me for free. It has no pull starter no rear brake handle or foot pedal. I have been using a rope as the pull starter. The problem is that it runs good for about 5-10 minutes and then the idle speed picks up and it eventually shuts off. It then leaks alot of fuel out of the air box. Then I have to wait about an hour before it will start again. Also the spark plug was very black. Any ideas what is wrong with this thing?