Seafoam is your best friend man, I absolutely SWEAR by that stuff, it's kind of hard to find, usually at auto parts stores, but drizzle some on the carb, it'll be clean, fire one of those engines up and drop in a little seafoam in the carb as it runs, it'll run like it's brand new. Then, when your done, pour the rest in your cars gas tank and by the next time you fill up you'll be mapping out the places that carry it.