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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3979
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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2004 Yamaha 200HP 4 stroke outboard alarm going off. How do

Customer Question

2004 Yamaha 200HP 4 stroke outboard alarm going off. How do i troubleshoot?
Submitted: 2 months ago.
Category: Boat
Expert:  Charles replied 2 months ago.

Hello, my name is***** will assist you.

Is this a solid tone alarm or a beeping one?

Would you please post the full model number of the engine?

Customer: replied 2 months ago.
It was a solid tone. On multiple occasions, Engine rpm was reduced to 500 for a few seconds then it shur off. It is a 2004 F200 4 stoke 6 cylinder
Expert:  Charles replied 2 months ago.

Do you know when the last time that a water pump impeller was installed on the engine?

Customer: replied 2 months ago.
2 months. They are new.
Expert:  Charles replied 2 months ago.

There is only one impeller on the engine. There are two thermostats, are both of those new as well?

How is the oil level in the engine?

Customer: replied 2 months ago.
Hahaha i have 2 engines that's why i used the plural.... thermostats changed 3 years ago (less than 100 hrs)
Expert:  Charles replied 2 months ago.

Is this a salt water boat?

I had to go and rescue one of my cars. Sorry for the delay.

Customer: replied 2 months ago.
it is always in the water.
Customer: replied 2 months ago.
No worries, i fell asleep
Expert:  Charles replied 2 months ago.

If this is a salt water boat, The thermostats should be changed on a yearly basis. This is due to the effects of the salt on the metal of the thermostat. It will corrode it and can cause the T-stat to not open at the correct temp and thus cause the engine to overheat.

If the alarm is going off on both engines, you can also check the fuel for water.

Customer: replied 2 months ago.
I understand about the thermostats ill look into it. Regarding the fuel in the water, would that cause the alarm to go off? I thought it only went off on overheat or oil issues.
Expert:  Charles replied 2 months ago.

There is not any alarm for water, but it will cause the engine to run poorly.

You can tell if they are corroded just by the look of them.

Expert:  Charles replied 2 months ago.

Hello, you had requested the phone call when I was off line.

Did you pull the thermostats and look at them?