Hi I just bought an older starcraft to rebuild and it has a 86 30 hp motor on it, when I fired the motor it runs SUPER and purrs like a kitten but when i went threw the gears to make sure reverse , neutral, and forward worked ,every thing was fine the first time but now it is stuck in forward and it is like there is no resistance in trying to get it to neutral or reverse is there a pin or key in these motors that could have sheared? now the shifting handle just floats back and forth doing nothing lol.. HELP PLEASE im trying to learn all I can about this boat as I plan on keeping her for a long time.. but this has me really confused.. thanks for your time.