Help with 79' Evinrude

[fishaddict1]

I have a 15 foot boat with a 1979 Evinrude 25 hp motor. Last fall my brother mistook the shift for the throttle and pushed it as far forward as he could and then pulled it back. Now it is stuck in reverse and won't shift to forward or neutral. Looking at the motor when you move it from forward to reverse everything seems to be moving that should be. I don't know anything about motors so if anyone has any ideas or things to check I would appreciate it.