If anybody can help just bought a 1976 21ft boat with the OMC 235 horse I/O. First day out and already BIG Trouble. It has electric shift and we were going along at about 2500rpm and BANG the boat stops dead in the water with the motor still running. I gave it gas and it went no where. I also noticed shifting from foward to reverse there was no differece. Towed back to shore and out of the water I reved it up to 3000rpm in neutral and prop spins barely. It also spins in foward and reverse around 3000rpm but seems like prop should go faster. Its not the sheer pin that broke earlyer in the day the first time we got towed back to shore. Oh and the prop does not spin at an idle in foward or reverse like it did earlyer that day. ANY IDEAS WOULD BE GREAT THANKS!!!!