I have an Echo 240 stick edger that I accidentally let sit this winter with some fuel in the Walbro carb. It wont start now and I want to learn how to "de-gum" a carburetor. I let things like this happen all the time and am tired of spending $40 and three days of downtime to get it fixed. I'm mechanically minded, I just need to know how to do something before I start. I have an air compressor and solvent, am I on the right track? Thanks for the help!