Weber 44 IDF mixture help needed Options

[tornik550]

I am working on getting my idle jets correct. My mains seem ok.

At idle (800 rpm) I am getting a reasonable air fuel ratio (14.8 using innovate a/f gauge). I'm using 50 size idles. If I slightly press and hold the peddle to a steady 1200 to 2000 rpm the a/f goes to 19. The car drives like crap until I reach 2000 rpm when the main jets kick in- at the same time the a/f ratio goes to 14 or so.

What adjustments can I make that will leave idle at the same mixture however rich up the mixture til about 2000 rpms? I thought that was mainly idle just only?

I did try to increase the idle jet size to 55. The idle mixture goes down to 11.8 at 800rpm and is perfect between 1200 to 2000 rpm. Confused- I can either get the idle correct OR the low rpms?

I have followed weber's info on best lean each time I switched jets.

Ideas? What am I missing- i'm sure its something simple.

[tornik550]

I don't understand how I can Make the mixture richer at 1200 rpm while keeping the mixture the same at idle (800rpm)?

[mrbubblehead]

I don't understand how I can Make the mixture richer at 1200 rpm while keeping the mixture the same at idle (800rpm)?

you dont want the mixture to be richer at 1200 rpm you want it to be leaner. you want your idle/progressive circuit to be as lean as the engine will let you. your mains are what you want to be rich. 12.5 A/F.

a lean idle progressive circuit will run cooler and yield the best gas mileage.