Re: 115 Yamaha overheating
Pull your thermostat and see if its sticking closed. While you have it out crank up the engine on muffs and you should get a good geyser coming out of the thermostat hole. Does it overheat at speed or did you not run it to find out? Some outboards will pee fine with a stuck thermostat, it depends on where the pee line is relative to the cooling system. Heat up the thermostat in a pot of water and check the opening temp with a cooking thermometer. If this doesn't help you need to pull the lower unit and replace the water pump.
