Stuck throttle

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Stuck throttle

Postby Baron » Thu Apr 11, 2019 8:07 am

I have a 1950 cub with a stuck throttle lever. I have checked from the lever to the govener and from the govener to the carb. Both are free. So I gues now I have to remove the hood / gas tank to look into the govener itself.
Any pointers on what I might be getting into or suggestions on what I should do at that point.

Thanks for the help.

Jim Becker
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Re: Stuck throttle

Postby Jim Becker » Thu Apr 11, 2019 11:55 am

Read this thread.

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Re: Stuck throttle

Postby Urbish » Thu Apr 11, 2019 12:36 pm

My newly acquired Cub LoBoy had this issue as well. The lever arm on the governor was rusted in place. I've been spraying it with PB Blaster and it is slowly working loose. Right now it moves, but still has a lot of resistance. If it doesn't continue to free up, I'll have to pull my hood and do the same as you.

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Re: Stuck throttle

Postby Glen » Thu Apr 11, 2019 5:40 pm

There is a place where Cub throttles get stuck sometimes.
Below is a pic from TM Tractor of the left side of the governor. Look and see if it is stuck there.

If you have the hood on, look in from the left side, by the fan, with a light, and apply penetrating oil to the shaft where the cotter key is.
Then from the right side, apply penetrating oil to the right end of the linkage piece. It pivots on the shaft in the parts manual pic, that I posted the link to, in the link that Jim B. posted above.
It may have to soak for some time. Keep working it gently, and applying penetrating oil.
Oil it with motor oil when it comes loose.
The piece can break if you hammer on it. :)
Cub gov 3.jpg

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Re: Stuck throttle

Postby inairam » Fri Apr 12, 2019 6:18 am

It is best to remove the lever and not drive the pin out. If you hit the pin use a wood dowel. The shaft is not hardened and will mushroom making the job harder.

You did not mention your ignition. If you have a mag and you decide to remove the governor to work on it on a bench, position the engine to TDC compression on #1 cylinder. This will be a big help to get the timing correct when you reassemble.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Stuck throttle

Postby Trail_Rider » Fri Jun 07, 2019 8:20 am

My 75 had the same issue. Stuck governor, I could move it by prying with a screwdriver one way and the other way with the throttle handle. I kept it soaked with PB Blaster for about six months and about once a week I'd move it back and forth with the screwdriver, it finally started loosening up and now it seems to be working just fine.
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