Re: 2001 Yamaha 150 Looses Power
Hope by this time the problem has been corrected. However, if it is not, you may be having thermostat issues, especially if the motor is used in salt water where corrosion is more of a problem. I just replaced the two thermostats in my 150, both were corroded badly, one was stuck open, I don't know what the other one was doing but think it may have been partially functional. In any event, if you have a stuck-open problem then the engine is not getting to the proper operating temp and won't perform. My dogging-down problem was really intermittent, but I haven't had the problem since the thermostats were replaced. Perhaps this will give you another area to explore.
