You probably will need to remove the carburetor and rebuild it. Likely there's some trash or varnish which is clogging one of the air circuits or the fuel nozzle. I would soak it in a carb cleaning vat, but you can try spray cleaner. Spray cleaner will only work about half the time for this purpose so you'll have to decide which is more cost-effective for your needs. Reassemble using a carb kit that contains new gaskets and a needle and seat.

If you can give me the model and serial number off the engine I can give you part numbers you'll need and maybe more detailed instructions. Thanks, PK.

Generally what happens is that when a engine sits up the gasoline in the carburetor evaporates and leaves waxes and other deposits behind which gums things up. A second problem that has really started to mess things up the past few years is the ethanol blended fuels. They break down the materials used in small engine fuel systems and manufacturers are just now really starting to use materials that aren't affected by the ethanol.

In fact, when you use a fuel stabilizer, you should be sure that it is made from isopropyl alcohol and not methanol just for this reason. The best way to store a small engine for more than a month or two is to run all the gas out of it and leave it empty.