I just bought a boat with an 88ish 60hp Evinrude. The boat ran and shifted OK. I took it out of the water, and was going to work on it's rough idle. Put the muffs on it and it started went into forward, but wouldn't shift into N or R. The linkage moves on the motor, but it stays in gear. I loosened the screws on the control box, because I was going to take them off, but then decided not to and re-tightened them. for some reason, I turned that knob right below the the ignition key, next ting you know it is N, but will not go into F or R. The throttle wants to pop up when I shift it back and forth. Is that black knob the culprit, played with it, but still will not go into gear. FML