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Old 01-25-2008, 10:41 PM   #1
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Default HIGH ALTITUDE

Hi
I have a 2005 1900 SR3 and we take it to Shaver Lake a few times a year and it runs pertty bad. It has a carburetor and there are no adjustments to lean it out for it is a sealed unit. Has anyone had this problem and if so how did you deal with it?

Thanks
Barney
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Old 01-26-2008, 12:12 AM   #2
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Shaver Lake, California? At altitude, you loose 4% horsepower per 1000ft above sea level.

Not my words but I agree with the info. I 'hijacked' this info off another site. Hope this helps.

"It's a common problem with big changes in altitude. There is an idle stop
adjustment screw on the throttle linkage right at the carb. You'll need to
turn that screw in a bit to raise the idle stop of the carb. This is
essentially the same thing as keeping a tad bit of throttle applied at idle.
This will at least allow the engine to idle at high elevations. But you
will still experience a significant drop in power, which will likely need to
be compensated for by a drop in pitch of your propeller. Also, if you
intend to run at that altitude for an extended period of time, the carb
should be re-jetted for that altitude."
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Old 01-26-2008, 01:58 AM   #3
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Thanks for the reply. It idles just fine but takes forever to plane if four people are in the boat one has to go to the bow. A buddy told me to put a 17 pitch prop on and don't worry about it but I think I'll over rev with the 17 I have a 23 on now I could try a 21 and hope it would work. I have 190hp so I think I have plenty of engine. Any advice will help.

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Barney
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Old 01-26-2008, 04:18 AM   #4
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I'd try a 19" prop...17 might be way too much underpropped...
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Old 01-28-2008, 04:00 PM   #5
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Thanks for all the help I know a prop men that may let me try a 21 and a 19 at no charge as long as I don't damage them.

Thanks again
Barney
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Old 01-28-2008, 07:32 PM   #6
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let us know how it goes!...
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Old 01-28-2008, 11:58 PM   #7
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Sorry Mad Max I forgot to answer your question. It is Shaver Lake, Calif. About 5500 ft. Not that high but high enough to affect the air to gas mixture.

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Barney
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