...and if you have trouble getting it to start initially after changing gas, you could always pull the plug and flame the end a bit to cook off any residue.
There's a very slight chance they gooped up the valves really good, in which case gumout/carb & choke cleaner will be your new best friend. I'd only expect this if they ran it for a very long time (weeks).
(It's going the other way and running straight gas in a 2-cycle that causes some serious pain)
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