I have recently purchased a boat and motor and had taken it out for a test drive. For the first 20 minutes the boat ran great started easily and all. After about 20 minutes the engine started to slow and loose power until all power was lost and the motor shut off. After it died I tried to get it started and noticed that gear shift seemed to be more difficult to change gears, infact it was just shifting between forward and reverse skipping neutral all togeather. The engine is an 1987 model. Any help would be greatly appreceiated. Thanks, Dave