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If it is just when its idling low between welding or no generator load then its more than likely the Carb. All of mine do the same thing if I don't keep em clean. U can probly get away with taking the bowl off (while trying your best NOT to break the thin gasket), clean the bowl out, take the float assembly off (CAREFULLY) don't loose the spring, spray 2+2 Carb cleaner...yes I know that stuff is a lil pricy but it works great. Use tip cleaners first through all the tiny holes that you can get to. I dunno what its called but there should be one straight up the center make sure you get that one, then spray them too. Use a good fuel treatment heavy the first 5 gallons or so. After that just use what it recommends. I recommend Lucas fuel treatment. It has worked great for me a long time. If you do that it should work along with a couple little adjustments on the carb
check the choke cable mine was doing the same thing . i changed the plugs put new air filter and it still done it til i noticed the choke cable wasn't in it's right place and by that i mean the weathering on the rod of the cable thats exposed to the enviroment was darker than the rod that sits inside the sleave .i took some aero kroil and lubed the cable up fire the machine up and the problem was solved. to this day even though it doesn't hang up any more i still check the cable to make sure it's pushed in the correct amount and not to far.