Careful with Stabil, especially the pink/red stuff.
While it's intended purpose is to introduce additives to prevent the natural breakdown of gasoline, it also contains a high concentration of alcohol which when combined with your typical pump gas already injected with 10% ethanol, the end result is that the gas is more likely to separate any suspended water or moisture and increase an already serious problem with ethanol laced gasoline. Matter of fact that stuff shouldn't even be sold IMHO. Now Stabil does put out a marine formula which is specially designed for high humidity/moisture areas and has a much different formulation which includes enzymes that counteract the effects ethanol has on gas and water separation, however you'll also notice it's significantly more expensive. There are other alternatives out there as well, I happen to use Star Tron but be very careful not to use something that increases the alcohol content of the gas, while it may not go bad if you try to burn water in your engine it won't last long at all.
As for the lawnmower problem, those things are not exactly designed to be fixed, if they break or start to run crappy, throw it away and get a new one. I've wasted more time trying to fix one of those cheapo Chinese made pieces of junk and you simply can't. If a new spark plug and new tank of gas and a good dose of carb spray down the throttle doesn't cure the problem throw it away. FYI those things are built with a very short life expectancy so that every few years you're out buying a new one. Of course they are never advertised with a maximum life expectancy of less than 100 hours.
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