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Chuck

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On Fri, 19 Sep 2008 13:49:44 -0400, wrote:

On Fri, 19 Sep 2008 12:04:38 -0400, wrote:

On Fri, 19 Sep 2008 11:49:52 -0400, wrote:

On Fri, 19 Sep 2008 09:23:55 -0400, wrote:

The symptom described, if on a smaller motor, requires removing the
top engine cover, and turing a screw about 1/8 of a turn or less.

Not anymore. These new motors are usually EFI and there isn't a screw
to turn. He said "pontoon" so I am thinking midrange (40 and up)
As I said earlier, on my Merc the idle speed is controlled by the
computer via a pulsed solenoid valve. The throttle body is completely
closed. If you pull the hose off the idle control solenoid you can rev
the engine up by controlling the air you let in by holding your finger
over the end of the hose. The computer will adjust the mix to the
amount of air it sees on the MAF sensor and what it sees in the oxygen
sensor.

For the VERY last time - I said on SOME SMALLER MOTORS. My smaller,
newer, 4-stroke motor has a CARB with adjustable needle valves.

And that is suitable for a pontoon boat?

Depends on the pontoon boat, and what you intend do do with it, but
sure it would. What does a 25 foot pontoon boat weigh? My "smaller"
4-stroke outboard pushes a 5000 pound displacement hull at hull speed
at about 1/4-1/3 throttle.

OK. I will get back to you guys next week on what the actual problem is. I
haven't been under the cover on this one at all yet.

Chuck

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