1986 2cycle 2 cylinder. Won’t shift gears. With the lower unit off I can go from forward,neutral and reverse by moving the shaft with my hand. I keep thinking that I have the cam that prevents the unit from kicking back in reverse in wrong. I am at my wits end and would take it somewhere if I knew who would fix it right. If I left off the cam just to see if that’s the problem would that work? Is there any other things I should check? I am going to try one more time and then find a repair shop that would work on old outboards. It is a 35 hp.