1976 135HP EVINRUDE model# 135683G<br /><br />It was fine for 20 minutes in the water and all of a sudden I lost forward progress, it whine up so I immediately shut it off. I cranked it back up and slowly push forward the throttle and it was grinding and motor now rev-ing up with little jerk movement so I put it back to neutral and try my reverse. The reverse was fine. I drove it back on reverse. <br />I haven't mess with it yet. I need some ideas of what I should be looking for. Never really had any serious problems with the engine. So I'm not mechanically incline when it comes to boat motor.