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Mysterious find while I was in there??

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Old Aug 28, 2025 | 11:49 AM
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Default Mysterious find while I was in there??

Hey there all C3'ers and of course the title says it all almost!!
I found a L-shaped L what looks like a shiny bracket and in the middle was a screw on the passenger side of the QJet below the fuel inlet that was next to a vacuum line that routes to the dizzy...
Can anyone tell me what the screw is and what is it used for???
I tried to take a pic but could not get close enough to get it framed
JJ78
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Old Aug 28, 2025 | 12:45 PM
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Is this the same 17056206 from your previous thread? A picture that shows the general area would be helpful. My first thought would be the fast idle adjustment screw.

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Old Aug 28, 2025 | 01:05 PM
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PIERSONPIE,

Yes sir that is the screw on my 78
To adjust the fast idle does the screw turn in clockwise or counterclockwise to raise the speed???
JJ78
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Old Aug 28, 2025 | 02:40 PM
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Clockwise to raise.
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Old Aug 28, 2025 | 02:55 PM
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Correct! 1250-1300 is a good spec to shoot for.
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Old Aug 28, 2025 | 06:11 PM
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OK I'm thinking about 1/2 turn to start and go from there?
JJ78
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Old Aug 28, 2025 | 08:11 PM
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Originally Posted by JavaJolt78
OK I'm thinking about 1/2 turn to start and go from there?
JJ78
You don't need to experiment. Set it on fast idle and adjust it to spec.
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Old Aug 28, 2025 | 09:01 PM
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Originally Posted by drwet
You don't need to experiment. Set it on fast idle and adjust it to spec.

Originally Posted by JavaJolt78
OK I'm thinking about 1/2 turn to start and go from there?
JJ78
Mike -
Just start the car up cold and turn the screw to the desired fast idle rpm. I set it to 1270 rpm when I set the carb up for you. Instructions for this were included in the installation instructions with your carb.

Lars

Last edited by lars; Aug 31, 2025 at 05:31 PM.
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