there are honda conversions that are tri-fuel. I have my honda 2000 and honda 2200 converted to run on gasoline or natural gas. I have the jet to switch to propane if needed. Conversion is easy and I have a hose for the generators that plugs into the NG BBQ line outside the house. Conversion kit is from hutch mountain. At least with NG no worry about running out of fuel!
Generator runs fine on NG or propane. Coupled it with a transfer switch that lets me run 6 internal circuits in the house. Furnace, Fridge, lights in some rooms and kitchen and living room outlets.