You are missing some governor parts. The take up spring on the linkage is gone, the governor spring is gone. The take up spring can be any weight or size, it just keeps pressure on the linkage. P/N 3097. I use a standard hardware spring for it that I bend to make work. I don't have either one of the other parts in stock but I could lay my hands on them. Governor spring is a 4001. The throttle cable would tie in right at that bolt below the governor arm.
I think it was more interest between Jesse and I. We both think about alike on these old engines and he knows just as much if not more than I do about them, so I for one enjoy engaging him in conversation about them. Incidentally, my guess was wrong.
Thanks Ben, we have a common interest and is conferring on and off the open fourm in the interest of collectors such as yourself and the preservation of these tractors and engines.
I truly enjoy discussing engines with Ben, he is very knowledgeable and has years of experience, no spat, bred and buttered iron heads are a unique breed.
The governor lever is bent inwards towards the head, was in a S shape for Carter N carbs, missing crankcase breather hose, Ben should have that also.
He hit the nail on the head with the governor spring and take up spring but what about the little L shaped lever the take up spring hooked onto with the throttle cable being attached to the cable holder on the block pushing and pulling the lever ? much like Choremaster's one wheel wonder, all variable speed Clintons had them unless it is set up differently for this tractor.
The throttle set up in the picture below is wrong but it shows the L-shape variable speed lever with the throttle cable pivot lock.
Can see why your model number ended in AOA , the cast iron sump with the extra casted mounting tabs is the base block variation. BB is something i am still working out.
my guess was wrong also with the dipstick, just caught myself in time, we are not experts in anything at all, always something new to learn.