I have a 6500W generator & I am careful about using stabilizer, shutting of the fuel & running all the gas out of the line, & rotating the gas at least every year. I am still concerned about the carb gumming up. I have seen several carburator modifications on the internet that could convert my generator to use natural gas, propane, and gasoline. In addition to reducing the chances of the carb gumming up, it would also allow the use of other fuels if I ran out of gasoline. Has anyone ever converted their generator? Do you have any suggestions on what system to use? Manufactures? Lessons learned?