[John Rogers]

As Jack suggested, probably gummed up from our wonderful gasoline. I found that I had to run all my 2 stroke engines at least weekly and that included weed eaters, giant R/C race cars, edger skate board and any others or they would never run right. I finally would drain and flush the ones not used such as the trimmers and that cured the problem. I found that in a couple cases the fuel lines actually collapsed from gasoline chemicals and there would be no flow so I'd replace them.