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Can you slow down the idle in the governor?
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- ShawnAgne
- 5+ Years
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Can you slow down the idle in the governor?
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.
Shawn Agne
- Glen
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Re: Can you slow down the idle in the governor?
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.
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.
- ShawnAgne
- 5+ Years
- Posts: 838
- Joined: Sat May 07, 2016 5:13 pm
- Zip Code: 45380
- Tractors Owned: 1952 Cub w/ 184 motor (Kid)
12V with Petronix
IH 3160 Mower Deck
54 Leveling Blade
193 Plow
IH528 Trailer
Front/Rear Weights
1955 Farmall 300 (Clarence)
12V with Petronix
Woods L306 72"
1955 Farmall 100 (Thomas)
12V with Petronix
Woods L59 60"
A60 Leveling Blade
Front/Rear Weights - Circle of Safety: Y
- Location: Versailles, Ohio
Re: Can you slow down the idle in the governor?
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.
Shawn Agne
- radioguy41
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Re: Can you slow down the idle in the governor?
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.
KB3WBB
- ShawnAgne
- 5+ Years
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- Joined: Sat May 07, 2016 5:13 pm
- Zip Code: 45380
- Tractors Owned: 1952 Cub w/ 184 motor (Kid)
12V with Petronix
IH 3160 Mower Deck
54 Leveling Blade
193 Plow
IH528 Trailer
Front/Rear Weights
1955 Farmall 300 (Clarence)
12V with Petronix
Woods L306 72"
1955 Farmall 100 (Thomas)
12V with Petronix
Woods L59 60"
A60 Leveling Blade
Front/Rear Weights - Circle of Safety: Y
- Location: Versailles, Ohio
Re: Can you slow down the idle in the governor?
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.
Shawn Agne
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Re: Can you slow down the idle in the governor?
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.
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.
When you only have 9 horsepower you need to know the names of all of the ponies!
- Don McCombs
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Re: Can you slow down the idle in the governor?
I doubt that the issue here is with the Cub engine. Has to be the tach and/or the way it’s being used.
- radioguy41
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Re: Can you slow down the idle in the governor?
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.
KB3WBB
-
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1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
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130 with international 1000 loader 6 v
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Re: Can you slow down the idle in the governor?
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?
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.
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.
I have an excuse. CRS.
- John *.?-!.* cub owner
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Re: Can you slow down the idle in the governor?
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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