i’ve got a 50cc. just put a 20mm carb on it and when the old carb was on it the line was attached to something with three different nipples on it just dangling around. when i put the new carb on it started to rev up like crazy so i immediately went to assuming it was a vacuum leak and found that. i looked at a parts bike i have and saw the fuel lines hooked up to that so i got it hooked up properly but it still wants to run away. i took off the vaccum line and it died so i started it bike up and put my finger over it and it started to rev up again. I found a nipple on my intake and tried putting it there but it still idles way too high and the throttle almost sticks after i give it gas. somone help lol