Thermostart switch

[junaidi]

I have change to new thermostart switch.I have tried to put in in boiling water to see if it's work but the engine still running.Ive tried to heat it with lighter but still running.What is the problem.My engine is yamaha 2 stroke 85hp

[99yam40]

What does your service manual say that switch is for?
My 40 has two ,one tells the motor when the motor is cold or warmed up and the other tells it when it is overheated and sounds alarm and restricts the RPM

[junaidi]

Its say when overheating it will limit the rpm.

[99yam40]

Then it should set off an alarm also.
So, what is your question?

[junaidi]

From what i know that thermostart should limit the rpm or even shut the engine when the engine is overheated.When i start the engine and put the thermostart in boiling water,the engine still running.then i tried to heat the thermostart with lighter but still nothing happen.what is the prob

[99yam40]

It only limits the rpm to around 2000. you will not notice anything at idle.
But it should set of an alarm if you have it hooked up

[junaidi]

thank you for the info

[junaidi]

Any ideas how to activate the buzzer at the throtlle?i just want to cx wheter the buzzer still functioning.

[jb123]

12 v to it or ground the pink wire at thermo switch

[junaidi]

Ok.i will try to ground the pink wire

[junaidi]

TQ for the info,I've try to ground the pink wire and the buzzer is still functioning.One more question,my engine is shaking at idle,not like normal but steady at higher rpm.I have clean tne carb,cx all the fuel inlet at fuel pump but still shaking.Any ideas?

[junaidi]

I have ground the pink wire and the buzzer is functioning.tq for the info.one more thing,what is the purpose of the thermostat at the top of the cylinder head.I have remove it from my engine and does by removing it affect engine performance?

[99yam40]

It forces the water to circulate to all parts of the motor and cool properly and keep the motor temperature at the proper temp so that the fuel will burn properly. it is not recommended to run without

[junaidi]

TQ for the info,I've try to ground the pink wire and the buzzer is still functioning.One more question,my engine is shaking at idle,not like normal but steady at higher rpm.I have clean tne carb,cx all the fuel inlet at fuel pump but still shaking.Any ideas?
Edit/Delete Message