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Yamaha OX66 going into slow mode limiter mode

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Yamaha OX66 going into slow mode limiter mode

Old 05-30-2019, 04:59 PM
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Default Yamaha OX66 going into slow mode limiter mode

Yamaha 2000 ox66 twin 200HP 26 foot cobia...
What I think is going into slow mode... speed limiters mode... under acceleration (limp mode----Limiting rpm) Cylinder miss fire...under load....canceling cylinders out what ever you may call it!
This happens as soon as I leave the dock.

Here's what I have done so far...
Two years ago pulled off cylinder and cleaned out all cooling passages ( they where about 70% clogged up)
It was going into SLOW mode back then but has been ok till now.
Just trying to give all the history of my motors.
Now just recently I have done a
Compression test all cylinders with in 5% of each other
New spark plus gap to 0.40
New fuel filter and water separator's
New low pressure fuel pumps
Swapped ignition coil from port motor to starboard motor.
Fuel pressure @ 35 psi and steady

Any thoughts will help.
Thank you
MB
Old 05-30-2019, 05:04 PM
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My 150 ox66's heads were plugged up with crap, as soon as I'd go past a certain RPM, it would go into limp mode. Took the heads off, cleaned everything and it works great now. Not sure if this is your issue, but it was mine.
Old 05-30-2019, 05:34 PM
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Two years ago pulled the cylinder head off and cleaned out all cooling passages ( they where about 70% clogged up)
It was going into SLOW mode back then but has been ok till now.
Good call though...
Old 05-31-2019, 07:14 AM
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Which gauges do you have
does your alarm work
have you ever checked/replaced waterpump, thermostats, prv

Last edited by wetneck; 05-31-2019 at 08:01 AM.
Old 05-31-2019, 05:42 PM
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eThe buzzer only work on the port motor as far as the gauge it does not work. only the port side buzzer and gauge work...
I am going to buy a new gauge this week and replace the buzzer for the starboard motor.
I thought that if the buzzer work on my port motor it would also alert me of any over heat or oil level issue with the starboard side.
Am I wrong to think that?

The water pumps pop off valve may have about 40 hours on them.
I am also going to order the diagnostic tool to pull codes ( Winky Blinky)
MB

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