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Recipe to tame the bucking OX66 while at high idle?

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Recipe to tame the bucking OX66 while at high idle?

Old 04-29-2011, 05:12 AM
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Default Recipe to tame the bucking OX66 while at high idle?

I've got a pair of '99 225s, slightly over 400hrs that run fantastic (knocking on wood right now). They crank right up every time, idle great, no excessive smoke, instantly get the boat on plane, and will run a consistent 52-5300rpm at any given load. Awesome... right?

However, anything off-idle 1200-2500rpm, under load - they turn into angry bastards that shake the boat...;? I don't want to sound like I am over exaggerating - but it is pretty annoying to me and I'd like to find a happy medium. I don't expect them to be as smooth as a HPDI or 4 stroke - totally different animal.

Sooo, maintenance/repairs I have attempted:

-Plugs
-O2 cleaning
-LP pumps test ok
-VST tank/filter is flawless
-All other filters/separators - good
-Oil pump linkage alignment is within spec.
-Penzoil synthetic marine oil

Only thing I have to admit is I haven't used ring free like a lot of people suggest. I am on my first "concentrated" cycle now.

What about motor mounts? Tilt bushings? I seem to have some play in the tilt bushings... when the motors are trimmed up, I can grab the lower unit and bounce the motor around while noticing shaft play at the trim hinge.

Thoughts anyone?

Thanks!
David
Old 04-29-2011, 05:57 AM
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Are these engines new to you, or is this a new problem that suddenly came up?

Pretty sure that motor drops one cylinder up to about 850 RPM, and two cylinders up to about 2000 RPM.. runs on all 6 above that.

Do some searching on "Yamaha Outboard CCS" for more info.

-- Tom
Old 04-29-2011, 07:31 AM
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Originally Posted by stripertom View Post
Are these engines new to you, or is this a new problem that suddenly came up?

Pretty sure that motor drops one cylinder up to about 850 RPM, and two cylinders up to about 2000 RPM.. runs on all 6 above that.

Do some searching on "Yamaha Outboard CCS" for more info.

-- Tom
This is my 3rd season on the boat and they've always done this... thanks for the info Tom!

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