I bought the boat about 1 year ago. Shortly after I got it I noticed that the overheat alarm would go off around 5000 rpms. I took it to the shop and they replaced the impeller and housing. This didn't fix it. I used the boat the rest of the season and as long as I didn't hit 5000 rpms, all was OK. About 2 months ago, the problem was getting worse. I changed the plugs and noticed that the 2nd plug was white and foamy. I took it to the shop and they replaced the side exhaust cover because these were common problems with force engines and it was the cheapest to try. Well the problem got worse. The engine would overheat at 3500 rpms. I took it back and they replaced the head gasket and installed a new impeller (old one was in good shape) and back flushed the system to ensure no blockages. Took the boat back out and the first trip was great. No overheating. Boat ran great. The next trip out motor began overheating again at 4000 rpms. Took boat back to shop. This time they planed the head and another new gasket. Our next trip out, we rode for about 1 hour or more and everything was great. We rode at max rpms off and on testing it and it seemed to be better than ever. Well just before heading back, the motor just quit. It seemed very hot but no buzzer. I let it cool a bit and it started back up. After about 10 minutes, it shut off again. I got it started again and then noticed that no water was coming out of the p-hole. I let the motor cool about 30 mins while being towed back to the dock. I started it again and water was coming out but only about half the usual amount. A minute later the water quit so I shut it down.<br /><br />I took it back to the shop. The impeller was in great shape. Water seemed to be flowing from the bottom to the top out of the thermostat housing. Also, this motor hasn't had a thermostat since I have had it. They said that is common around here in the southeast because the salt and sand plug them up a lot. They take them out most of the time. I called them today and they are going to tear down the power head to see if they can find anything.<br /><br />This repair shop has done all of my work and they haven't charged me for most of the latest work and they probably won't charge me much for this tear down. Does anyone have any ideas, or do you think tearing down the power head is a good idea? The compression on each cylinder is 154 to 160. They said that it has great compression.<br /><br />Thanks in advance for your help. Sorry about the long post, I just wanted to be sure I didn't leave any details out.<br />Eric
