engine reving up and down

When you increase the throttle to about the place where it should be for the PTO, is jumps about 500 - 1000 rpms. Revs up and down. Something to do with the govener. What should I do? I can idle it at pretty low.

So, if you don't know what to do specifically on a 4000, for any general tractor, what would you do. Thanks. Paul

Keith

Get yourself a good service manual for your model tractor, either from a dealer or an IT manual. There should be a governor set-up procedure in the manual. Follow it and get it adjusted properly. If that won't cure your problem, then you may have other problems inside the governor, like worn parts. The manual should cover repairing that too.

At least, that's what I would do.

I'll argue this one until the cows come home.

The carb and the governor need to be syncronized so that they are both doing the same requested function.

If the carb is trying to open up and the governor is trying to shut it down, the result is a never-ending flare repeating over and over again.

Proceedure is in your IT manual.

Allan

• Hobby farm

At light load, the carburetor is operating on the "idle" circuit, as the throttle opens, fuel flow tranfers to the "load" circuit. There are passages that supply fuel to aid in this transfer, and if they're clogged, the engine will "falter" as the mixture goes too lean. Then, the governor will jerk the throttle open, and fuel flow will be through the "load" circuit, the engine will gain speed, the governor will close the throttle, and the cycle will repeat.