I have a question about my outboard Johnson, 25HP, 2 Stroke. In December I took it out on the river and ran it about 6 miles up river with no problems. I sat with the motor off for about 4 hours fishing. I started the motor up and began my run back to the launch. About 15 minutes into the run, a loud audible alarm went off and would only go silent after I turned the motor off. At first I thought the motor may have been overheating, but I pulled the cover off and checked the heads on the motor, I was able to place my hand on the heads and the heads seemed at normal temperature. The motor was putting out water through the port on the motor, may have been a little weak? Two weeks later I ran the motor on the flusher for about 45 minutes then I took it out on the river and ran it similar to the time in December. This time however there was no issue with the motor, or audible alarm. It ran strong and well. In April I took the boat out and ran it. I ran it about six miles up river and set for a few hours fishing. About 5 minutes in to the run, the audible alarm sounded. There was water flow coming out of the port on the motor. I placed one of my fingers in the exhaust port and removed some oil on my finger. I started the motor back up and it ran fine the rest of the 25 minutes back to the launch. I talked to my boat dealer, mechanic and he said he didn't think anything was wrong with it. He never looked at it, but I described what it was doing to him. I'm not sure if something is wrong or not. I don't have a lot of experience with boat motors. Any input from anybody would be greatly appreciated. I'm thinking that the waterpump may be on it's last leg, but not really sure. Thanks.