Farmall Cub... throttle snaps open too quickly.

when you advance the throttle on a cub, it should snap open slowly, or if it does open faster, the governor should immediately reduce the amount of throttle and the engine will wind up smoothly.


On the combine power plants, the throttle response is very quick and over dramatic. It will cause a normal cub to stall out.

There are 2 adjustments. bumper spring and fast idle, on the governor. Which one of these adjustments corrects the problem, going from a power plant governor to a regular cub tractor?

I did take the slop out of the linkage, had the typical slop where the linkage has a key way to the gov.

I did also adjust the carb linkage so that with the throttle at wide open, the carb is at wide open with the engine not running. (I've had my share of cubs over the years)

Seems like every gov I get from a combine has this hyperactive disorder and wants to surge hard... bummer...

So, anyone know where I should begin? bumper spring adjustment? fast idel adjustment? carb is tuned like a swiss watch, but on any updraft carb, if you have it at low idle and snap teh linkage wide open, it will stall it out. To prevent that, the gov should "govern" the linkage and not let it slam wide open at the mere touch of the throttle lever from idle.



tis baffling to me right now. might be lack of sleep, or my father's voice screaming in my ear... "Don't adjust the governor!!! check everything else!!!"

Fast idle only adjusts the RPM of the engine, so process of elimination, I would try the bump spring adjustment.

You kinda indicate that you've gotten combine governors before... How did you fix the problem then? Should be able to do the same thing now.

never could remedy the issue, now I have 2 with combine govs and no reg cub ones to switch out.

I might just be sending that one to e b a y and buying a standard cub gov. Oh how the little things in life make me want to scratch out my eyes. LOL

In the last few minutes I did think of something...

The combine governor may have different springs in it, which would explain the snappier response.

If you're up to the challenge, you could tear down the governor and replace the springs with the tractor springs.

I was thinking the same thing... has to be something different...


just not sure. IF you have a cub, you know what I mean about the throttle being behind the ball. It should never crack wide open with a touch. only 2 reasons for that... #1 the engine is bogging due to bad carb adjustment and the gov is winding down and tossing the throttle open. #2 something in the governor, or the setting of teh governor is different.

Want to build a fuel injection system now. add some O2 sensors, tps, iac motor... LOL make teh thing like a new car!