CARB compliant won't mean much for those things, but newer ones probably burn pretty clean. But they generally do not have catalytic converters so that is a good thing. If you run it on the choke setting (if it's carbureted) then it should spew out lots of CO. If your generator is fuel injected instead of being carbureted like a lot of newer ones are, I would not recommend it as a CO producer. It will just make a lot more CO2