Help, I'm not sure what year my 70hp motor is I can't find the info anywhere on the motor.It has a blue cover if that makes any difference, I have a few serious problems and really need help. I can't shift into reverse, at first when I tried the motor would jump and jerk no it just spins, along with that I have massive bubbles coming up fromj the lower unit. What is going on? I need help..I have tried looking at repair manuals but so far they are of no assistance.