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Old 03 October 2017, 12:56   #1
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Bigger outboard restrictions

Hi all,

I'm considering upgrading my 2004 Honda 90 on my Zodiac Open Pro 550. It works fine, but feels like it is at the bottom end of capable - when pulling skiiers I have to start slow and build up, otherwise the pressure stalls it.

The original boat specified up to a 115HP, but here's my question...

What is the main factor driving the size of the engine the boat is capable to take?

Is it weight (in which case, newer engines may be lighter for the same, or larger HP)?

Is it torque on the transom - i.e. something too powerfull might overly strain the transom

Is it just the boat length limitations - i.e. no point in going above X as it would not go any faster?
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Old 03 October 2017, 13:01   #2
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There is no way you should be stalling with load.

What rpm does the engine reach?
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Old 03 October 2017, 13:25   #3
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What size prop you might be too high on pitch to pull skiers,are you saying the engine stops under load which isn't right
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Old 03 October 2017, 13:37   #4
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Sounds like bogging out when you give it a big handful, possibly a carb issue, fairly common on a carbed Honda
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Old 03 October 2017, 16:44   #5
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I'm guessing you're trimming it right down for the "deep start"?

I get the same problem if I do that with mine because it pushes the pressure relief exhaust ports on the back of the leg under the water.

Try lifting the trim until the ports stop blowing bubbles
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Old 03 October 2017, 17:12   #6
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I'm guessing you're trimming it right down for the "deep start"?

I get the same problem if I do that with mine because it pushes the pressure relief exhaust ports on the back of the leg under the water.

Try lifting the trim until the ports stop blowing bubbles
Surely there has to be an underlying problem there if you can't power on without bogging out? I doubt the manufacturer made an engine you can't accelerate unless trimmed out
You would always trim in for best hole shot
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Old 04 October 2017, 02:37   #7
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Surely there has to be an underlying problem there if you can't power on without bogging out? I doubt the manufacturer made an engine you can't accelerate unless trimmed out
You would always trim in for best hole shot
It doesn't "Bogg out". It stalls before it comes over idle revs with the throttle wide. I've had it with a few engines...Evinrude, Mercury and the Honda.
It doesn't need to be trimmed out, just lifted off the bottom stop to relive the exhaust back pressure. Depending on how deep the engine is sitting the relief ports can be under the water.
I'd guess at 2004 his engine will be fuel injected as my 2002 one is.
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Old 04 October 2017, 03:47   #8
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It doesn't "Bogg out". It stalls before it comes over idle revs with the throttle wide. I've had it with a few engines...Evinrude, Mercury and the Honda.
It doesn't need to be trimmed out, just lifted off the bottom stop to relive the exhaust back pressure. Depending on how deep the engine is sitting the relief ports can be under the water.
I'd guess at 2004 his engine will be fuel injected as my 2002 one is.
So it's worse than just bogging out it actually chucks it at the critical moment? Sounds like a fault to me.
Not something I've come across unless there was a blocked jet or accelerator pump problem
Is this what's to be expected of a modern engine? Personally if I took delivery of an engine that behaved like that I'd be handing it back.
If the engine was fitted to a boat that sat deep in the water then relief ports would be underwater anyway regardless of trim.
Imagine a car that chucked it at the lights every time you floored it.

Anyone else experience this on a new engine?
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Old 04 October 2017, 03:58   #9
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OP. Does it do it all the time or just when you've got a skier(s) connected?
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Old 04 October 2017, 06:18   #10
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So it's worse than just bogging out it actually chucks it at the critical moment? Sounds like a fault to me.
Not something I've come across unless there was a blocked jet or accelerator pump problem
Owned 16 boats over the years and seen this problem on at least half a dozen of them with different engines. both fuel injected and carb'ed.

Only an issue with a skier on the back and easily worked around. A bit like dropping the clutch too fast on a car.....the engine revs are to low to to produce enough power to move the car, the throttle is wide open throwing air at an already lean engine and....it stalls. No big deal.

I'm guessing you wouldn't take your car back to the dealer because you stalled it?
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