Problems with 30HP Yamaha

[wit01157]

I have problems with my 30HP outboard.It runs fine on Idle and starts immediatly. When I throtlle up a bit It seems like one of the three cilinders is getting cut off so there is less power an a wild shaking engine. I already changed coils and sparkplugs without result. The item that I don`t trust is the temperature sensor. Is it a sensor or is it a switch but then is it NO or NC. I can`t messure anything on the switch/sensor. No resistance and no switching when held in boiling water.

The dealer says that it is the pickup sensor failing. But then it should fail at all revs doesn`t it ??It seems like a sort of safety mode of the ignition unit , doesn`t it?

Has anyone any idea to help me out ???

Regards T de Wit

 

[esteym]

Re: Problems with 30HP Yamaha

Hummmm....

Its fuel or spark most of the time. Does the bulb get soft afterwards? Check your fuel lines and when was the last time you replaced the fuel pump? Rodbolt suggests every 3 years. They are inexpensive to replace and can cause a lot of damage if they fail.

Your pick up sensor (timing advance?) is mechanical ..... at least it is on my 150. Different animal I know, but without a year on the engine or other details there is no way to tell. There should be an arm connected to the throttle arm - guessing here since that is how mine is set up - that controls the spark advance on the strator. Make sure that is still connected. If yours is computerized / injected... I'm no help.

If it is a safty mode, your alarm should go off I would think.

Anyone else?

 

[wit01157]

Re: Problems with 30HP Yamaha

It is not a fuel problem. I have cleaned the carburator exchanged the fuelpump with anather yamaha(25HP same pump) Ball stays hard.

What do you mean bye mechanical. Only the pre ignition timing is mechanical but it still has a sensor beneath the fly wheel wich tells the cdi unit when to let the bobine`s fire to the spark plugs.

Dealer says it is this sensor wich is failing but I think that the motor also shoudn't run at Idle then.

The alarm buzzer is broken. But what I would't like to know how the sensor or switch at the cilinder head is working.