overheating 115 yamaha 2 stroke

[patrikhorstmann]

I recently bought a Yamaha 115 2 stroke 1995. On several occasions a loud beep sounds and the engine has no more power. I let it cool off and I resume after a minute. I assume the engine overheats. I do not have a manual of the boat or the engine. This occurs mostly when I have 5 people, a cooler, full tank on board. Is this normal, that the engine overheats with that load. I am new to boating. I have a 19 foot wellcraft Open Fisherman. Thanks in advance!!!!

 

[jim dozier]

Re: overheating 115 yamaha 2 stroke

You should check the engine for a strong tell tale stream ("pee stream") while you are using it. If it falters or is absent shut the motor off. Most likely culprit is you need a new water pump. They usually only last a couple of years and can deteriorate (the impeller is rubber) while the boat sits. On a new (to you) used motor you should probably replace the water pump impeller as a matter of course. Other items at fault could be<br /><br />- a stuck closed thermostat,<br />- mud or crud in the cooling passages,<br />- leaking head gasket<br /><br />Get a manual

 

[Bozo]

Re: overheating 115 yamaha 2 stroke

In addition to overheating, not having any oil in your tank could also cause the problem. There is a sending unit in the oil supply tank that could cause the same alarm to trigger.<br /><br />I was having a simular problem and all it ended up being is that the battery connection was lose and the sending unit wasn't receiving the proper voltage to register properly and the computer was shutting down the motor. <br /><br />My scenario would be the quickest and easiest to check. Then I would ensure that the oil tank under the cowling was being replentished with oil from the main oil tank. <br /><br />I would also change the water pump impeller just as a preventative maintinance thing. Take your thermostates out and verify that they are not crudded up and that they are able to open up. You can do this by placing them in a pot of water on your stove and heating the water. they should open up way before the water boils.