Mysterious find while I was in there??

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Aug 28, 2025 | 11:49 AM

JavaJolt78

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From: Dover, Delaware

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

Aug 28, 2025 | 12:45 PM

Piersonpie

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From: Minnesota

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.

Aug 28, 2025 | 01:05 PM

JavaJolt78

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From: Dover, Delaware

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

Aug 28, 2025 | 02:40 PM

TKX 5-SPEED C3

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From: Toronto, Ontario

Clockwise to raise.

Aug 28, 2025 | 02:55 PM

Piersonpie

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From: Minnesota

Correct! 1250-1300 is a good spec to shoot for.

Aug 28, 2025 | 06:11 PM

JavaJolt78

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From: Dover, Delaware

OK I'm thinking about 1/2 turn to start and go from there?
JJ78

Aug 28, 2025 | 08:11 PM

drwet

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From: Thunder Bay

Quote:

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.

Aug 28, 2025 | 09:01 PM

lars

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From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by drwet

You don't need to experiment. Set it on fast idle and adjust it to spec.

Quote:

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.