There's usually no need to resort to carb cleaner, antifreeze baths, etc to loosen up a gummed engine, rubbing or denatured alcohol (or even glow fuel) works just fine. As was suggested, pour some in the carb, through the plug hole, and in the exhaust port. Turn the engine over a bit, pour it out and put some more in. Do this several times and it'll loosen right up. Don't forget to work the carb too. Once done, I usually put it in the oven for 5-10 minutes at about 250 to evaporate any remaining fuel. Once it's cooled a bit, lube it up and it "should" be good as new. The reason for hedging is if the engine didn't have enough protection while it was stored, the bearings could be rusted. It would be worth removing the back plate to take a peek at what it looks like inside. If you see signs of rust, or the bearings feel rough before you've lubed them up, it would be worth replacing them.