Carb Idle Adjustment??
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Logistics Pro
Joined: Oct 2002
Posts: 4,489
Likes: 5
From: Valley Center, CA
Carb Idle Adjustment??
I know this is very fundamental, but I have a nagging problem with my Autolite 1101. I have rebuilt the carb completely and everything seems to be working correctly. My problem is that I am not sure on how to set up the idle correctly. First I adjust the high-idle screw down until the primary is closed and only the idle circuit is providing fuel. The idle drops to 100-200 rpm. The engine is barely running and acts like it wants to stall. I adjust out the idle needle valve, but the idle does not rise. (started out at 1.5 turns from bottomed-out) There is a small brass adjustment on top in the front that I have tried adjusting but seems to have no effect on the idle. Is there something wrong with my idle circuit or do I just need to adjust the high-idle screw to open the primaries a bit?? Any help would be appreciated as I am new to the six-cylinder scene. I did try increasing the idle by adjusting the high idle screw, but the engine did not idle smoothly. 
Thanks, John
Thanks, John
Senior User
Joined: Oct 2003
Posts: 215
Likes: 0
From: Central Coast, CA
Hi John. I think most of us that are running carbs are running Carter YFAs. A needle valve sounds a bit like the mixture screw. When I ran a really simply YF without any dashpots or solenoids, there were two screws on a bracket within the throttle assembly on the carb. The upper screw I'd fiddle with (along with the choke cap) when the motor was cold to get the screw to hold the choke cam (of sorts) in position. The regular curb idle was a matter of turning the lower of the two screws. I'm not sure if this helps or not.
