Mercury Outboard 150 Overheating

[Keithh41]

Motor keeps over heating, at 4000 rpm's temp hits 180 and goes into limp mode. Go to neutral and resets operates fine till it gets up to 4000. Replace water pump, thermostat, and temp sensor, still overheating. Any ideas would be most appreciated

 

[fitz73222]

Bad poppet valve if so equipped

 

[Keithh41]

no poppet valve equipped

 

[racerone]

Blown head gaskets cause overheating.

 

[faztbullet]

What year 150HP?

 

[Keithh41]

Blown head gaskets cause overheating.

Would blown head gasket effect motor running

 

[Keithh41]

What year 150HP?

2020 with only 80 hrs.

 

[racerone]

Sorry----I guess it is silly to think a head gasket might cause this issue of overheating.

 

[faztbullet]

This is a 4 stroke?

 

[Mad Queen]

We have a 2018 150 and at year 2 the motor started shaking and loss of power over idle speed. Tow it to basspro twice a yr since then with still no resolution. Changed thermostat, water pump, impeller, alternator…..
We argued for a new motor with no such luck but basspro still can’t figure it out .. ugh

 

[fitz73222]

Find a different Mercury Dealer.