there's a small spring... maybe 3 inches in length that was on the backside of the carburetor that broke, that holds tension on the acceleration linkage. I'm not sure where one end hooks to. One end goes in an "arm" coming out of the carburetor... but the other end I'm not sure where it goes. In the Jim Carter catalog they have a vertical spring and a spring holder tab bolted onto the oil pan. Mine doesn't have that tab, so I'm not sure what it hooks to.