There is one thing fairly easy you can try. You take the aluminum bowl (bottom) off the carburetor. There will be a brass bolt with a washer holding it on. When you do this the carb will leak gas so you should drain the fuel first or stick something under the carb to collect it. There will also be a gasket between the bowl and carb body. Don't mess it up. The bowl should be cleaned and have no residue or dirt or water in it..the brass bolt is the big concern here though. Inspect it closely ...tiny holes in the smooth part above the threads...and bottom...make sure they are clear. Use carb cleaner Dont enlarge any of the holes...clean with toothpicks, no metal....this is the main jet to the carb. Try it.