I have about 25 miles on my 80cc jet stealth motor running 16:1 and I can't seem to get the thing to idle. When I start it it takes a few tries and then starts and runs good, but will not idle. When I turn the handle bars it revs. up. Dark oil/fuel leaks from exhust when it sits overnight, leaves a small puddle. I have tried to tweek the carb and adjust idle from the thottle connection(can make it idle really fast but not a slow idle) 1200rpm I would be happy. I still have the stock chinese spark plug.