Need help on F20 tractor

I have an old f20 tractor and when we start it up it takes off rapidly. The throttle won't idle it down eventhough it turns the valve, but the only way we could get to idle is using the choke. I tryed adjusting the carberator screws to see if it helped but it didn't. Just can't seem to get it to idle slow without using the choke. Pease help because I can't seem to figure it out. Plus the carb is rebuilt. Have any ideas i could do to fix it?

I don't much about them, but it seems that
you might not have the governor connected,
or not working properly.

I actually had a tractor, a CA Allis, that
over a period of a year or so inside my
shed, the throttle butterfly in the carb
stuck to the side of the carb. When it
started the governor pulled it back to idle
and the screws broke off in the throttle
shaft and the butterfly dropped out causing
it to race.

Hello RW welcome to YT. A lot of posters here that are
knowledgeable about these tractors also like to go to
shows and also many have tractors they actually take
to shows. Most shows start on Friday so a lot of them
are simply busy. I am far more familiar with the letter
series Farmalls as opposed to the F series. What I can
do is get you a copy of a partial manual for your
tractor. The part that is included covers the engine and
gear train so it has information about the governor. If
you send me an email I will reply with the info to
acquire it. You have to be logged in on Modern to see
the email button at the bottom of my reply box.

If you have had the carb off and back on
ahead of this trouble you are having, the
first thing I would check is the
throttle/governor shaft where it hooks up
to the carb butterfly shaft on the carb.
There is a nob that fits into a slot when
that is put together. The nob must be put
into that slot when that is put together.
It can be put together without that going
correctly into that slot, and if so, it'll
do what you are explaining.

It's kind of tricky getting that put
together right. You can't see very good
when your putting those two shafts together
(mating them up). And as it goes together,
you go from not being able to see much, to
not seeing it at all as it slides together.
Even if you have a good idea that it is
matched up, it's kind of a guess and a hope
that it is. I don't know why IH didn't make
this so it couldn't go together wrong, but
they didn't. Not one of thier better ideas.

Anyways, check that first, and post back if
that's not the problem.

You don't want to tear into the governor
unless that's really your problem. Rule out
all else first. If you didn't do anything
to the governor, that's the last place I'd
turn to. Not the first.

I have to ask and probably is not so . But do you have the choke hooked to the throttle and the throttle hooked to the choke? That would also acount for the racing with the choke rod pulled by the throttle and vise versa.

That's not really possible. Choke is a push pull rod. Carb throttle butterfly is hooked up to a shaft system from governor.