carb issue

Did you put a new one in? It should have come with the kit. You may have something hanging up in there, could be a gasket leak, if it continues to drain off I would pull the carb and look inside again.

It truly sounds like the bowl is draining overnight. In the morning pull your air cleaner and open the throttle slowly and see if you get a shot of gas, immediately. When you begin moving the throttle you should see a shot of gas instantly.