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The biggest problem with these things is stale, old gas. If thats the problem all you can do is try to clean the carb (it's not worth paying to have it fixed.) It is really important to not leave old gas (3 months) in the unit.
But you may want to check the air filter. If the air filter is somewhat soft and does not crumble try washing it throughly, with a little dish soap and then reoil it with a couple of drops of oil. Note, if it is the filter, unit will start with it removed. A spark plug could be a east fix. What exactly is it doing when you try to start? Is it doing anything or totally dead? Is it possible it just got flooded?
I agree with Matt but would add that a 40:1 gas oil mix goes stale quickly because it separates in addition to evaporation. I regularly leave gas in my tractor and washers ( don't do this at home ) all winter and they start up fine year after year. Set a weed wacker or blower down for 4 months and you have trouble. A carb the size of your thumb clogs up so darned fast it isn't funny. I have found that flushing with a good carb cleaner gets them going again 2 out of three times. Be careful don't to spray that cleaner in your eyes or near flame. I won't explain how I know not to do that.