Remove the engine cowel and put the throttle (at the helm) in neutral. Take a look at the sift linkage arm on the engine. There is (should be) a line on the housing under the arm. It is the neutral position. If the arm doesn't line up with the mark, the cable needs to be adjusted ( easy to do). If it does or if you adjust it, ytr moving the throttle several times from neutral to foward and back to neutral to see if it stll lines up. If it seems to wander, you have a bad cable or a bad binacle ( probably a cable)