'38 F20 Governor/Throttle Issue

Ken Christopherson

Well-known Member
Hello all! Well, the first show for the F20 this year was a success. Had a couple of small hiccups (flat tire on the 1947 M, and now a flat on the rear of the F20).. But in all a success. I've been trying to iron out a couple of small issues with the F20.

The first is the idle which I am confident that it is the idle passage that is plugged. It runs real rich at idle, and the idle mixture screw doesn't have any affect on how it is running until I remove it completely from the carb. Just a more thorough cleaning I think is what I need.

The second is on the throttle response. I get very little response from idle all the way to mid range where it suddenly takes off to about 1/2 throttle. I have looked over all of the linkages and pins, and it seems all is tight there. I removed the cover on both the carb side (on the front of the crossover tube from the governor to carb), and also the oil fill/governor cover and screen. Inspected all moving parts, and all pins, etc., seem to be in very good shape. When looking down into the governor housing, and having someone slowly pull back on the throttle lever, there is a spot about mid-range where the fingers and sliding assembly 'snap' open allowing the engine to increase speed. It is to my understanding that this tractor should have the variable speed governor on it, allowing for a gradual change in RPM (not just idle, mid range, and WOT).

When I operate the governor itself by hand from inside the oil fill, I can slowly increase the RPM without issue. Also, when I operate it from the throttle lever, once I go past mid range RPMs and return it to idle, the engine does not return to idle unless I crack the throttle quickly and push it back to idle. If I crack the throttle up, then slowly dial it down, I can pretty much select any RPM I want...

Any suggestions? I am pretty much stumped. It is almost like it is hanging up somewhere, but when taking everything apart and putting it together, everything seems to move freely.
 
Ken,My regular ran the same way,and the governor was stuck.I don't remember exactly but I opened the housing enough to slide a steel bar against it and hit it with a hammer and all was well
 

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