140 throttle issue

Fri Feb 28, 2014 12:20 pm

I have a 140 that I just got running and need some advice.
I put new float,needle and gaskets on the carb to get it running
but here is the issue;
With the throttle all the way back to the 1st notch, it cranks and
idles perfect. 1/2 way between the 1st and 2nd notch it speeds up
to average RPM but if it gets to the 2nd notch completely, it speeds
up till it's running wide open. I can't figure what I need to adjust
or if I have something hooked backwards. Any ideas sure would
be appreciated.

Re: 140 throttle issue

Fri Feb 28, 2014 12:51 pm

First of all, welcome to the site!

Will it allow you to push the throttle lever all the way forward or will it resist? Are you getting full range of motion in the lever but once it reaches a certain threshold it just doesn't do anything? Are you able to bring the lever back towards you (idle down) past the notches, and does it bring the idle down?

First place I would investigate its the governor. Try adjusting the bumper screw (21) [just don't put it in too far] or speed adjusting screw (8). I'm not entirely familiar with the governor, but according to the diagram it looks like if either one of these is too far in/out it might prevent the throttle from advancing properly, of course this is speculation. But I would definitely investigate along those lines.

Find out what range of motion the governor speed change lever (9) will allow. Also, does the engine hunt at all, not able to keep a constant RPM, just goes up and down and up and down? I'm sure the others will chime in with better assistance, I'm just trying to narrow things down.

Re: 140 throttle issue

Fri Feb 28, 2014 1:12 pm

Thanks for the information. I'll check those tomorrow.
As for the throttle, it will go all the way forward with no
resistance, but I am afraid to do that for fear it will blow the
motor. Also, I see a spring in the picture you shared, but I don't
remember seeing a spring on my Zenith/Bendix Carb.. Maybe that's
the part I am missing. Hmmm.......
The engine runs fine, no hunting or "up and down"
with the engine speed.


Re: 140 throttle issue

Fri Feb 28, 2014 1:22 pm

No problem. The picture is the governor. It is on the other side of the tractor. Number 10 on the diagram crosses the front of the engine to the other side and connects to the top of the carburetor. And you will only be running the motor that high for a second (if will go that high), I doubt it will harm the engine. If it does idle WAY up, just don't leave it like that.

The GREEN is the governor. The BLUE is the throttle linkage, goes to the lever. and the YELLOW is the rockshaft arm (its hard to see thought), it connects to a rod that connect to the carburetor (Not attached in image)

Now granted this is a Super A with a C113 engine, and your 140 has a C123, but they are similar. That diagram in my last post covers the C113 and C123.

If you need anymore pictures for reference, I will be glad to go take them.

Re: 140 throttle issue

Fri Feb 28, 2014 2:53 pm

thanks for the pics. I need to find some manuals for this thing.

you asked about the throttle earlier and I missed it.
On the throttle, with the lever in notch 1 the engine idles
, just purrs. But, at notch 2 it is running...to me.....at
peak engine speed. I mean it is wide open.

I'll check those 2 screws and fiddle with it a little tomorrow
or Sunday afternoon.

Thanks again for the responses and advise.
I need all the help and guidance I can get.

Re: 140 throttle issue

Fri Feb 28, 2014 3:30 pm

You can pick up an I&T shop manual for it. Tractor Supply will have them. For your 140 you will be looking for the IH-201 version. Version number is located on the top right corner of cover.
http://www.tractorsupply.com/webapp/wcs ... _vc=-10005

Re: 140 throttle issue

Tue Mar 04, 2014 11:55 am

Well this weekend, with the help of my 6yr old grandson running the throttle for me, I discovered the
lever on the carb. which hooks up the throttle linage, was loose. I removed the carb and found that the lever will spin round and round freely. It is supposed to be bradded or pressed on that shaft to keep it in a fixed position. What must be happening is the governor is running the engine wide open since the throttle is not holding anything.
Got to get ti tack welded or bradded/stamped back in position and I think it will fix my issue.