Governor (1945 A) Revisited

If that part is ok make sure the linkage from the governor to the carb is FREE & not hanging up on anything. Hold the carb & governor arm in the wide open position & adjust the front rod to be about 1 hole short of entering the carb lever hole.. When re-installing the front carb rod cotter pin make sure the cotter pin isn’t hanging up on the carb casting [a rather common problem]..

If it still acts up look for a problem in the carb like a loose throttle plate or excess throttle plate end wear..

You have a strange problem there as it is acting up in both acceleration & over-run [coast].. Usually a broken or warped governor spring will not allow the engine to speed up correctly under a load but that doesn’t usually effect the return to idle as the governor wants to pull it to idle anyhow.. It sure sounds like a linkage hang up problem or a problem inside the carb..[maybe work the carb & linkage by hand a few times & see if you can feel any hang-ups]..

One last thought--- Make sure the governor top arm & spring are installed facing the correct direction.. If that arm/spring is on backwards you will only have manual throttle control & not very good control at that..

JDClooney@aol.com

45A, the governor spring is correct when you pull the hand lever all the way to the rear,, then hold the governor arm in place,, then move the hand throttle to wide open.. If the spring & arm are on correctly the spring will bend when the hand throttle is advanced… Then when you let go of the governor top lever it should snap the carb to wide open [all done with the engine NOT running]..

You ask ..

Quote: “I’m not exactly clear as to how it should work. It appears to me, that centrifugal force of the flyweights would cause them to move away (toward right side)from the control arm, and if the control arm (fork) isn"t in contact with the weight assembly (mine isn"t, at the moment) the governor would have a hard time controlling speed. Am I missing something here?”…..

--I’m not exactly sure what you are saying here so see picture…The governor’s job is to TRY & hold the carb’s throttle plate closed as much as possible.. The spring’s job is to try & open the carb’s throttle plate as far as possible.. When the governor weight pressure balances the spring pressure the throttle stays steady,, as the engine slows down the governor weights lose some of their centrifugal force so loose some push & the spring wins & opens the throttle more… When the engine revs higher the governor weights gain some centrifugal force so gain some push & the governor wins & closes the throttle more.. It’s a simple push & shove match between the governor weights trying to close the throttle & that big flat spring trying to open the throttle.. In a nut shell,, simple as that!

Quote: “how is the W.O.T. set? Is there a special tool for this, or is engine speed limited "by design" of throttle, governor (if working)?”….

---The “W.O.T.” is set by a limit bolt at the hand throttle lever area.. It just limits the distance the hand lever can deflect the governor arm spring.. To tell what the “W.O.T” engine RPM is you need a hand held shaft speed tac to place on the center of the either the crankshaft or the PTO shaft then count the revolutions for one minute..

Any more questions just post back..

JDClooney@aol.com