Yamaha two stroke 150

[Flinn]

I have a 150 yamaha two stroke 2001 and it runs fine at low rpm's but when I run it faster the alarm goes off and it shuts down to an idle, water continues to spit, any ideas?

[GITRITE]

I would say the first thing to do is replace the entire water pump.

[Double R]

I have 2 1998 150's on a Century center console and have had the same issue for over a year. My mechanic has not figured it out. Changed impellers twice and raised and lowered motors on transom, issue still there. Not always same motor. I am starting to think it might be an electrical problem?

[Anthony Millette]

I have a 1992 150 with the same problem it has been happening for the last 3 years and can't find anyone who can fix it. I have replaced the water pump, emptied all the oil to get rid of any water in the oil and still get alarm . I did notice if I start out slow and build up the RPM's it will not give me the alarm it is when I am idling to long or when I give it full throttle the the problem comes on.Any help or ideas would be appreciated.

[Bob Gilvary]

Download an owners manual and see what else causes your alarm to go off. I believe you'll find that the low oil/no oil will also cause it to sound off. If the oil injection is up to par, then it could be the sensor assembly in your engine oil tank that's faulty.

[erniefish]

water pump, thermostats, and poppet valve, three simple parts, , that being said, can you you overide oil and fill the tank ? i cannot think of anything else that would send it into alarm mode,let us know as i learn a lot of this board