I don't understand your explanation, gray. Do you think the problem is at the control end, in the cable itself, or at the carburetor end? You can probably tell by watching the cable inner at the control end when you move the lever. Some of the very old types of control lever have adjustable friction: a central screw that squeezes the lever so that it will stay where it is put. On the more modern plastic ones, the cable can sometimes get squeezed or kinked if the screws are tightened too much. Is the cable lubricated? Also, watch for sharp bends in the cable: that increases the force required.
