Peter 2 stroke fuel goes stale after a period of time also what you need to do is each time you stop the generator turn the fuel off first and let the motor run the carby dry as when the fuel evaporates it leaves this gunge from the mix that can block the jets of the carby also 30% of an engines wear will happen in the first few moments with a dry bore so starving it of the lubricant is not a good practice. The stuff with the 2 stroke I know because I had a 250cc 2-stroke Honda Elsinore and had let it sit for ages after a full day of trying kick start it, to bump start it, stripping the carby down looking at the jets, cleaning the air filter pushing it up and down a hill (Steep) I read in the manual about stale 2 stroke fuel. Changed the fuel to a fresh mix hey presto first kick that's how I learnt about stale 2 stroke mixes. Also if you do get a little condensation in the tank tip a bit (small ok) of metho into tank metho helps destruct the water make up helping it mix with the fuel I had to do this with a V 8 falcon panel van I had got a crap tank from the 44 gal drum I was using on the farm so I put a liter of it in a full tank car ran a tad rough but cleared after a while. Just my 5c worth