Motobecane gas out of exhast

Derek . /
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This is for my Motobecane Mobylette 50.

So, I did get it running yesterday for a bit but today I noticed gas has run out of the exhaust port down the muffler? The Carb is brand new, a dellorto.

One odd thing was when I was cleaning up the moped, it looked like there was baked on caulking all around the exhaust port? I did add a new copper o-ring and copper paste on the threads.

What's everyones thought at this? In the pic you can still see traces of the caulking.

IMG_7493.JPG
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