Can you slow down the idle in the governor?

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ShawnAgne
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Can you slow down the idle in the governor?

Postby ShawnAgne » Fri Oct 06, 2017 6:51 pm

Using a light tachometer app on my phone I think my tractor is idling way faster than it should. However I'm not for certain and want to test it some more. Does the screw on the governor adjust this? If so which way do you turn it to slow it down? The induction tach is saying around 1830 with the throttle all the way back and if I pull it back farther the engine does slow down and seems to die around 1,100 rpm. This seems slow which makes me think I have the tach set in correctly.
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Re: Can you slow down the idle in the governor?

Postby Glen » Fri Oct 06, 2017 7:05 pm

Hi,
1830 is the full high speed for a regular Cub engine, 1800 RPM, the manual says.
But you have a newer engine, so I guess you could use 2000 RPM, IH changed to 2000 RPM in late 1955.
1100 is a moderate throttle speed.
The slow idle speed should be 500 RPM. A Cub engine runs normally from 500 - 1800 or 2000 RPM, whichever the high speed is for your year of Cub, when everything is working right.

I would use an automotive test tachometer that connects to the coil to check the speeds, one with a pointer and dial.

The bolt pointing straight up and down on the governor sets the high speed limit.
The slow idle speed is set at the carburetor butterfly mechanism, there is a small screw with a spring on it. That is at the top of the carb, on the side toward the engine. The screw can be seen from the front, at low speed. :)
Last edited by Glen on Fri Oct 06, 2017 11:14 pm, edited 1 time in total.

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ShawnAgne
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Re: Can you slow down the idle in the governor?

Postby ShawnAgne » Fri Oct 06, 2017 7:33 pm

Hmm, so this makes me wonder if the tach isn't set up incorrectly. I've put the induction wire on the cylinder closest to the driver so it doesn't get any intereference and it is still reading like it did on #1. Maybe I need to play with the different modes as I'm wondering if it isn't reading it twice as fast.
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Re: Can you slow down the idle in the governor?

Postby radioguy41 » Fri Oct 06, 2017 8:52 pm

Does the tach have a setting for the number of cylinders and is it set to 4? A tach set for 8 cylinders but connected to a 4 cyl will read twice as fast RPMs.
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Re: Can you slow down the idle in the governor?

Postby ShawnAgne » Sat Oct 07, 2017 4:10 am

Yeah it has a setting and it is set to 4. The thing is it tops out at around 2900 RPM and the motor is set for 2400 RPM. So I'm just wondering if there isn't a 500 RPM error possibly? Guess gives me somthing to play around with.
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Re: Can you slow down the idle in the governor?

Postby inairam » Sat Oct 07, 2017 6:44 am

i have used both the induction and the Digital optical Laser Tachometers. i find the optical tacks to be more accurate and repeatable. i used it on a lathe at work that we had a know rpm and it matched within +/- <1%. they are $12-25 on ebay and amazon.

from what you describe if the rpm is that high you have to adjust the linkage between the gov and carb and the idle on the cab to get the rpm down. there are a number of posts and good coverage in the manual on this.
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Re: Can you slow down the idle in the governor?

Postby Don McCombs » Sat Oct 07, 2017 7:00 am

I doubt that the issue here is with the Cub engine. Has to be the tach and/or the way it’s being used.
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Re: Can you slow down the idle in the governor?

Postby radioguy41 » Sat Oct 07, 2017 7:02 am

I would try a different tach before I attempted to adjust anything. Those RPMs aren't normal and the fact that you say it dies at 1100 RPMs would indicate an issue with the tach.
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Re: Can you slow down the idle in the governor?

Postby inairam » Sat Oct 07, 2017 7:13 am

I agree with Don and Radioguy try another tack. It has been a year or two since I used the induction tack but i recall a couple of settings not just the number of cylinders.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Can you slow down the idle in the governor?

Postby Eugene » Sat Oct 07, 2017 7:24 am

Agree with other posters, tach fault.

Static time the engine/ignition.

Set low idle by ear. You should be able to get the low idle reasonably close to specification.

Check timing accuracy with timing light at low and high idle.

Then check your tach's accuracy.
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Re: Can you slow down the idle in the governor?

Postby John *.?-!.* cub owner » Sat Oct 07, 2017 10:58 am

Are we all talking about the same terms? most people refer to idle as the slow speed, which is about 600 rpm give or take a little, and is adjusted by the idle stop screw on the carb. IH uses the term "high idle" which is full throttle no load, and is 1800. The high idle is controlled by the screw with jam nut on top of the governor. turning the clockwise (into the governor) limits the top speed. You should be able to detect a BIG change between the two speeds just by listening. If you do check your tach. If not, check the linkage for wear, spring holes worn or wrong throttle spring on governor, where cross shaft attaches to governor being worn, or linkage to car binding.
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