Carb set-up!
Thread Starter
Drifting
Joined: May 2002
Posts: 1,546
Likes: 282
From: Back in Nebraska
Carb set-up!
Just bought a rebuilt Q-jet. Everything looks good on the outside. However, the two needle screws (idle screws) on the front of the carb are screwed all of the way in. How many turns should I open them to get a good first start? I have heard 2 full turns open to start. Any suggestions or experiences?
Thread Starter
Drifting
Joined: May 2002
Posts: 1,546
Likes: 282
From: Back in Nebraska
Ok, I'll start at 2 1/2. Then while the engine is warmed up and at idle I close the screws until I hear the engine begin to stumble and then from that point back them out, what, about 1/2 turn?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
That sounds about right. But you want to make sure your timing/distributor set up is right and that you have no vacuum leaks before you work on the carb. Otherwise, you could just be masking other problems.
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
I don't think it will stumble unless you go way to far. Listen for the rpm drop. When you 1st hear it, stop there. The vacuum gage is easier IMO.
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