Carb throttle rod revisited

John T

Well-known Member
After I got the correct governor to carb linkage length adjustment info here the other day, I checked my adjustment (which I made like 10 years ago) AND IT WAS ALREADY SET 1/2 HOLE SHORT PERFECT. My Carb and Mag and Timing I will swear and bet just short of my life are PERFECT, usually start the FIRST PULL OVER and pulls strong and steady at constant RPM under load, however I get a small bit of throttle bumping and non steady (governor action) RPM. It does NOT hunt or bump or change RPM under load,,,,,,,,It does NOT hunt or bump or seek at slow idle. Its like ONLY at mid throttle range where I get a bit of bumping governor action.

I slept on it and recalled where I may have made my mistake. When I reset and meshed the bevel gears in my governor to fan shaft and replaced bearings etc etc I NOTICED THERE WAS A BIT OF WEAR AND SLOP IN THE GOVERNOR WEIGHTS AND PINS which I should have repaired way back then. Ima thinking the slop and wear in those governor weights and pins may be partly the cause of my slight unsteady governor action. Thoughts???

John T
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That may do it. A little more wear over the years too. Oil drains away when it doesn't get used much too. I had an F12 Farmall that the governor wouldn't work to my satisfaction. I put on another one I had & what a difference!
 
John, the slop in the pins could contribute to erratic action but I would also look at the radius on the weights where they contact the thrust surface. This radius needs to be ROUND. Most you see will have a small, flat surface worn on them. This seemingly small item can cause either the symptoms you have or just sluggish governor action altogether. The weight needs to be able to move totally unencumbered. Anything that interferes with that will cause an engine to run erratically. Mike
 
I still say it's the carb, raise the float level a bit & see if it changes. At no load part throttle you're not exactly using the idle circuits but the nozzle is not exposed to as much suction either, so the fuel is leaned out.
 

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