Alarm at full throttle after ~2 min

[kimma]

Hello- I have a yamaha 150 2-stroke. Recently an alarm sounds at full throttle after about 2 min. The engine is not overheating and is pissing fine. At time when I turn the ignition off, the engine continues to run. Once the alarm sound stops, the boat runs fine. The alarm only occurs at high speed/full throttle. Is this possibly a wiring issue?

[jb123]

you have analog or digital gauges ?

[kimma]

Analog gauges. I'm not certain of the year on the motor. I can check the serial # if necessary.

[99yam40]

Pull and test the thermostats and the temp switches to see if working correctly

[jb123]

for the overheat? replace PRV
when it happens again check level of main oil tank
for ign issue check harness ends for corrosion

[Looney toon]

did you get this fixed as I have similar issue