I have a 1965 Evinrude 40 Hp, problem it wont go/stay in forward, revearse is ok. My Daddy said it sounds like the shift dog is in backward, but I thought before I tried tearing this thing apart I would look for other suggestions. It will go in forward at low idle, but as you give it the gas it pops out; you can hear the gears chattering but it just wont stay in. You cant even hold it in gear by hand. Thanks for any help. 