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The low water pressure and overheating alarm has gone off 5 times in first 10 hours of operation on my brand new 2010 225 yamaha series II outboard. I hear the lower unit water intakes are designed bad and this is a re-occuring problem. How can I gert more water to the motor. Is YAMAHA aware of the issue?

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Not seeing anything particular, especially on this motor, there have been overheating on different models but nothing new like yours. Since it is new, please call the dealer who sold this to you, there is factory warranty that you need to use, if you alter anything then the warranty will be void. With that said, always make sure the stern is in the water deep enough to draw the water in, if trimmed it losses its ability to draw water like it should. The Poppet valve could be sticking or the thermostats can be bad, this is not that uncommon. Ther is also the hose that connects inside to the water jacket that may have come loose and not impossible but maybe you sucked up something that hurt the impeller for the water pump. Bad timing can cause this as well as a cylinder not getting the correct amount of oil. These thing can fall under the lemon law just like cars, if the motor had issues when you bought it, the manufacture is required to fix these issues. I wish I had a canned answer to this but there is none. It could be as simple as a bad temp gauge giving you a false reading. Does the motor actually seem like it is running hot or is the alarms just going off? 10 hours isstill a brand new engine and the dealer should have to remedy this. You need to find out if it is overheating or there is some other problem like running lean, as either one will destroy a motor if you keep running it like that.
I assume you checked the intakes for blockage, and the water coming out of the weep hole is strong and warm. You can try cleaning the weep hole with some weed trimmer string to see if something is blocking the exit.

Posted on Mar 14, 2011

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