idle mixture screw set up

[BimmerBoy2]

How do i set up the idle mixture screw so it is in its proper position?

And what exactly does it do?

[Guest Anonymous]

it controls the fuel/air mixure at idle. Unscrew it about 2 turns and then slowly screw it in while the car is idling. When the idle speed begins to decline, unscrew it 1/8 turn.

[BimmerBoy2]

un-screw it 2 turns from just where it is now or should i screw it in all the way and un-screw it 2 times?

[Guest Anonymous]

start with it all the way in. Or unscrew it slowly from where it is now until the idle speed drops, then screw it in until the speed increases and then just begins to decrease. You want to be on the "screwed-in" side of the best idle speed mixture.

[jgerock]

Whatever you do, don't overtighten the screws! A gentle touch is all you need when adjusting carburetors.

[BimmerBoy2]

ok but how do i know when it is screwed in all the way because i dont want to damage the internals...

[spets]

Here's my suggestion. Start with the screw where it is now. Start the engine, and start screwing it in 1/2 turn at a time. You should be able to see and hear the engine start to stumble before you bottom out the screw. Once it starts stumbling, back the screw out to where it stops stumbling. Voila.

[BimmerBoy2]

ok but how do i know when it is screwed in all the way because i dont want to damage the internals...

[Guest Anonymous]

you are over- worrying this - screwing it all the way in isn't going to damage anything. But if you don't want to do that, follow the suggestions we've made to move it in and out gradually (that's what....) until you find the sweet spot.

[cheaptoads]

you'll know its all the way in because it will bottom out- won't turn anymore. the point is not to tighten it like you don't want it coming loose, like a screw. and its not that you need to worry about the "internals" of the carburetor, but the mixture screw itself is a calibrated, finely machined taper- that's what you can damage by cranking it down.

[Collinster742002]

I just did this today. I'm assuming you have a 32/36, most of us do...

BEFORE you adjust the mix, unscrew the idle jet and make sure it's clean. simple procedure; can save you weeks of retardedness (me)

What I did to adjust the mixture:

unscrew the mix screw. remove it and clean the end. reinstall, tighten until it will not turn anymore with my fingers. it does not offer a lot of resistance, so it's easy to turn by hand.

then:

back the screw out 2 1/2 turns. Start your engine and see how it runs. adjust accordingly. 2 1/2 give or take 1/4 USUALLY does it for most cars, lets see about yours.

[williamggruff]

I just did this today. I'm assuming you have a 32/36, most of us do...

BEFORE you adjust the mix, unscrew the idle jet and make sure it's clean. simple procedure; can save you weeks of retardedness (me)

What I did to adjust the mixture:

unscrew the mix screw. remove it and clean the end. reinstall, tighten until it will not turn anymore with my fingers. it does not offer a lot of resistance, so it's easy to turn by hand.

then:

back the screw out 2 1/2 turns. Start your engine and see how it runs. adjust accordingly. 2 1/2 give or take 1/4 USUALLY does it for most cars, lets see about yours.

Ahah! I believe I just commented on your YouTube video, suggesting you visit this site. Please ignore my suggestion and carry on.

Cheers,

Grice