Schebler Carb no idle adjust

Hattrick · Jan 10, 2015

I have a scheduler carb that was just rebuilt. I can get it to start and it even runs ok but when I try to adjust the idle I can run the scream all the way in or out and it has no affect. I did not rebuild the carb myself and have not torn into it again but thought I would get some ideas. Not that it matters but this is on a farmall B.

rustyfarmall · Jan 10, 2015

(quoted from post at 15:26:53 01/10/15) I have a scheduler carb that was just rebuilt. I can get it to start and it even runs ok but when I try to adjust the idle I can run the scream all the way in or out and it has no affect. I did not rebuild the carb myself and have not torn into it again but thought I would get some ideas. Not that it matters but this is on a farmall B.

The carburetor is still dirty inside. Send it back to the rebuilder and tell him to do it right this time, or refund your money.

Hattrick · Jan 10, 2015

It was my brother in law. Maybe I need a new one of
those...I was going to tear it apart but was curious
why it still runs and not only that it runs pretty
good once it starts.

old · Jan 10, 2015

Pull the idle screw out and then take carb cleaner spray and spray into ti and that might clear it up

Hattrick · Jan 10, 2015

We will give that a try. Thanks

old · Jan 10, 2015

You do know that the idle screw work backwards as in out leaner in richer. .

glennster · Jan 10, 2015

Just a thought, but is the butterfly closing all the way? If the throttle shaft was removed, the butterfly may be a smidge off. Try loosening the screws on the butterfly a turn or two and re seating the butterfy, then tighten the screws.

Hattrick · Jan 10, 2015

Yes but all the way bottomed out or all the way backed out has zero affect on the idle.

old · Jan 10, 2015

Well not sure but I know on any of my machines I pretty much do not idle them at all. But all mine are work machines. Also the idle stop screw has to be set low or the idle mixture screw will do little or nothing

gab · Jan 10, 2015

Like Old said You have to back that idle speed screw out to a slow idle before the mixture screw will do much of any thing.

gene bender · Jan 10, 2015

Just what are you adjusting idle mixture or idle speed they are not the same

Hattrick · Jan 10, 2015

I am trying to adjust the idle mixture. I do not see what the idle screw would have to do with it as it is just a stop. Even if it is idling too fast if i bottom out the mixture adjustment it should change the idle or even die. I could see the butterfly having an effect though. If the mixture needle/seat and passage was plugged would it even run?

gene bender · Jan 11, 2015

If that circut is plugged it will start had. You just mite be looking for a problem that doesent make a problem if it starts and runs carb must be in pretty good shape. Idle mixtures on those tractors isnt usually a big problem.

rustyfarmall · Jan 11, 2015

(quoted from post at 21:33:29 01/10/15) I am trying to adjust the idle mixture. I do not see what the idle screw would have to do with it as it is just a stop. Even if it is idling too fast if i bottom out the mixture adjustment it should change the idle or even die. I could see the butterfly having an effect though. If the mixture needle/seat and passage was plugged would it even run?

If the idle SPEED is too fast, the idle circuit of the carb will not be in use, or will be by-passed. The idle mixture screw will then have NO effect, because that part of the carburetor is not being used.

Schebler Carb no idle adjust

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