Generac 4000EXL propane conversion spud in through air cleaner

Testing out a "spud in" type propane conversion on a Generac 4000 watt generator going through the side of the air filter box versus drilling out and "destroying" the gasoline carburetor. I know conversions exist using a "doughnut" adapter between the air cleaner and the carburetor intake but while not an issue with this unit; on another generator I'm planning to convert, the adapter will make the air box hit the frame. Got it working quickly but I'm still dialing in the fuel mixture and the governor on this particular generator seems to run a little fast at no load.