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Carb setup

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Old 06-27-2003, 12:06 PM
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foxflyer
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Default Carb setup

I have an old OS 40 SR that I want to put in a SIG Kougar. Does anyone have any suggestions for initial carb setup?

There is a screw in the center of the throttle arm/barrell. I loosened it thinking that I could change the position of the throttle arm, like on my 40 LA, then I realized that it is an air bleed or low idle adjustment or some such thing. I did not keep track of how many turns I backed it out.

This engine looks new, looks like it has not been run, great compression. I am told it was a hot engine for it's time. It is a ringed 2 stroke.
Old 06-27-2003, 03:12 PM
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MinnFlyer
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Default Carb setup

That IS a great engine. Try turning the screw all the way in, then back it out 2 turns. You'll still have to adjust it once it's running, but that should get you going.
Old 06-27-2003, 05:36 PM
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foxflyer
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Default Carb setup

Thanks for the info!

Is it a low idle screw? What is its function?
Old 06-27-2003, 06:18 PM
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mscic-RCU
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Default Carb setup

It is a low idle mixture screw. Low idle screws are very sensitive, so when you set the engine up, turn it just a little bit at a time.
Old 06-27-2003, 08:38 PM
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Default Carb setup

yup

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