How to bypass Yamaha alarm buzzer????

[mulli grub]

Hey,
does anyone know how to disconnect or bypass the alarm buzzer/rpm reduction on a Yamaha outboard??.

before anyone asks ,yes i have replaced everything to do with overheating or pressure, Also tested heads with IR guns X2, tested thermostat's in hot water,OHM test sensors, checked compression etc etc...... AND all checks out good.

im pretty happy that its not an over heating or loose wire or oil issue.

Yamaha 115 V4 ETLN

Cheers

[ausnoelm]

Fix what ever is wrong, either what's causing the alarm, or the alarm sensor itself, far better than having nothing to warn you and have a major disaster.

[boscoe99]

You say that you are happy that it is not over heating now, but what about the future? If you deactivate the over temperature warning system now, then the motor could very well be damaged if and when it does over heat in the future.

If this is a risk that you are willing to take then here is what you can do.

Coming from the CDI there should be wire harness with a gray/black tracer wire inside of it that goes to a multi-pin connector. That connector will be attached to another connector that also has a gray/black tracer wire attached to it. Simply open up the connector on the main wire harness side and unlock the pin to which the gray/black tracer wire is attached. Slide the pin from the connector.

Voila. If and when either of the over temperature switches close due to an over temperature condition the CDI will not be informed of the situation. The horn will not sound and the motor will not go into RPM reduction mode. You will be able to run the motor at power until it quits running on its own.

You did not say if you have a Yamaha tachometer so I am assuming you don't have the kind that displays an over temperature event.

[99yam40]

I would find what is bringing in the alarm.
If it is one of the temperature switches, then disconnecting the pink wire on them one at a time while the alarm is sounding will tell you which one is getting too hot and causing the alarm to come in.

Blocked cooling passage around one of the switches is my guess

[mulli grub]

one thing i have not checked is inside the exhaust manifold cover?.
will that cause overheating??.

[99yam40]

I will say it one more time.
Find out what is bringing in the alarm 1st, then look for ways to fix it

[boscoe99]

I thought that you said you verified that it was not over heating.

[99yam40]

He still has no idea what is bring in the alarm.
Just said he checked everything he could think of.
So it is best to find what is bring in the alarm

[throrope]

mulli grub - Yamaha doesn't spend money on safeties without good reason. They're configured to error on the safe side. If the safety switch fails, it also sounds the alarm. Yes, marine parts and service are expensive, but not compared to a new outboard.

I suggest either finding a trusted and certified Yamaha tech. Or, buy the factory service manual and an inexpensive multi-meter. Research the systems that sound the alarm and take time to systematically test each cause, component and connection. Keep notes. Start with the simple and end with the most expensive. A failed outboard on the water creates a long and costly day.