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Governor adjustment

T

txpoweranger

Member
Ih 454 gas removed cleaned and inspected governor,re assembled and installed adjusted per I&T shop manual,now the governor pulsating. I can remove linkage and carb works perfectly,any ideas where I messed up?
 
On many that can be a carb adjustment problem or a linkage problem.
Dose choking it hurt or help?? How's the air cleaner is it as it should be?? If you grab the carb linkage when it is running can you make it stop the surging and then even maybe have it run right?
 
Ah but that only means you can hold it in place and work as should. That is also normal since your removing the gov. from the system. You can still have a carb problem and be running to rich to lean so the gov surges
 
It's a zenith carb, I've been all through it and don't see anything wrong, other than taking it off and sending it off to have it professional rebuilt I don't know what else to do.
 
When you had to carb opened up did you poke out all the passageways with a piece of wire or as I do a torch tip cleaner tool and then blow and spray out all the passageways??. When one does a carb he needs to soak them then spray them out with carb cleaner spray and also poke out all the passageways or you will miss dirt etc.
 
Easy to miss a small piece of dirt/rust in a carb since one cannot see into many of the passageways. BTDT many times over the years. Also the I-T spells out the gov/carb adjustments and even doing that can take 2 or 3 tries to get it correct. That is why I say to try things like choking it and or holding the linkage while running. Have a friend who has a Cub that will surge at first start up but if one holds the linkage for a moment after start up the surge goes away
 
Sorry that I cannot tell you since I do not have that model tractor or the manual that you have
 

When reinstalling the throttle plate it needs to be carefully centered in the bore before the 2 screws are tightened completely.

If it is not centered properly it can mess up the function of the idle and transfer circuits, making for surging. (One side of the plate meets the bore in the area where there are drillings from those circuits into the throttle bore.)

The throttle plate typically has oversized holes, allowing for a little adjustment.

Back the idle speed screw off enough so the throttle plate can fully close and note how it fits in the bore, should be snug up against the bore all the way around.

If not, slightly loosen the screws and tweak it around 'til it is, then carefully tighten the screws while being careful not to jam the plate in the bore, then screw the idle speed screw back in at least enough to keep the plate from tightly closing, and reset idle speed after startup.

That MAY help with the surging.
 
Can't hurt to try adjusting the gov screw. Some do have a dampening screw that is supposed to help with idle surging.

Like others said, check the throttle plate to bore fit, lean idle mix, vacuum leak.
 
If you had the governor apart, you noticed the leaf spring on the same shaft as the fork. That leaf spring is the surge control. Some times those springs are broken off so then you cannot adjust them. To adjust, just run engine at a speed where it surges and screw that set screw in until surge stops. I you go in too far engine will not idle down. I'm saying to adjust this presuming you have every thing together correctly. If you cannot get a satisfactory adjustment, the thrust bearing in governor may have been messed up when apart as it is very touchy.
 
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