gas leakeing out through the muffler

alright, these are that changes I have made to my bike when this started happening.

I added a boost bottle/nitrous kit through the manifold, and I replaced the carburetor with a new one.

I then leave my bike in the garage for 2 days to find my entire full gas tank pored out beneath my bike. So I go ahead and replace the fuel line and check the carb for leaks and did not find one. I then assume the problem was solved

I was wrong.

After going for a ride today and coming back. I went ahead and closed the fuel line just in case there was a there was another leak, I went back about an hour later to find the fuel from inside the carb in a puddle directly under the muffler.

The engine is not getting flooded and the process is very slow,its almost as if the fuel is passing through the cylinder in vapor form and then condensing in the muff

The the bike is actually riding smoother than ever but fuel leakage is quite an annoying problem. Whats wrong here and how do I solve it?

edit: I currently have the bike outside chained to a pole. In the garage is would be at a slight angle on the kick stand, outside its fully upright and there is no fuel leaking out. although I do have the valve closed.

with the problem normal kickstand angle a little to the left, although chained to an upright postilion it dose not appear to be leaking, although may I have or may not have burnt the fuel out of the carb before I turned off the fuel valve.

I checked out the tank, when the fuel valve is shut off no more than the amount of gas than that would be in the carb leaked out.

it was fine before I replaced the carb and added the boost

When I got the carb in I found things odd about it, for one.
You know the little screw thing that goes on top of the cap on the carb where the cable attaches well on the new carb this had no hole in it that goes all the way through, it had enough to rest the end of the cable case on it but the screw part is a solid and had no place to run the cable through. I could not figure out what to do with that so I put the one from the old one on, they are the same length

also the spring is made of a different material and dose not seem to be quite as sproingy.

Also a change I made before I put the bike outside and then forgot I did it was, I tried to tighten the top screw where the throttle cable rests down as low as I could get it and I loosened the idle screw

I took the bike off the pole and set it on my driveway with some newspaper underneath and opened up the fuel line, it dose not seen to be leaking, so it would seem when I adjusted the idle screw this caused it to stop leaking fuel??

I'll go ahead and take apart the carb and figure it out in a few days but in the mean time, if I where to shut off the valve on both the gas tank and the carb (I actually forgot about the carbs shutoff valve), this would be a temporary solution to insure no leakage?