i have a 77 puch newport with 12 mm bing carb and a stock E50. i put a biturbo exhaust and hi-flo airfilter on it. i think i have a 72 jet on it, but i'm not sure. gonna have to check in the morning... anyway, i'm not even going 30 mph on it (like between 27-29 depending on the day). i feel like i should be going faster, and i eventually want to get it up to 40-50's without getting a kit. anyone know what i can do to fix the speed problem, then get it up to 50?