Great info! the video is good to see as well.
I did the test yesterday where I opened the choke manually, and the engine smoothed out a lot. I also could tell that it was running extra-rich because the exhaust was extremely gassy during the warm-up period. I closed the loop in the linkage a bit, and this morning's cold start went a lot smoother. It didn't run nearly as rough, and warmed up faster. However, I think I closed the loop a bit too much because it took me 3 cranks to finally keep it running. I'm going to open the loop up just a hair and I think it'll be dialed.
It seems crazy to me that the adjustment is to physically BEND the rod.
As always, I really appreciate the help.
Don't do it!
That is the wrong solution!
The correct solution is either
1)to increase the choke spring tension by lengthening the rod, or
2)More initial pump-shot.
But which one?
Well, the next time it is cold, and as soon as the choke is all the way open, tap it down, put it in gear, and attempt to drive away.
A) if it takes off without hiccups of any kind, then go to #2
b) if it sputters or stalls,the choke will need to stay on a little longer; go to #1.
But before you do anything; check that the accelerator pump is correctly adjusted, that it is correctly working, and that you are working it correctly with your foot!
Make sure that on a warmed up engine(key-off,lol) the butterflies open all the way when the gas pedal is floored.
When you first go to start the cold engine, You must pump the gas pedal
all the way to the floor! Depending on the outdoor temperature, probably more than once.
If the engine starts revs up and then quits; then it needed more pumps. Add one pump and repeat.
On the next attempt when the engine is again cold you must remember how many pumps it took last time and repeat that.
When the overnight temp was close to freezing, it might only take 1 pump in the morning. If the temp dropped to -10*C overnight,(+14*F if my math is right) then it might take 1.5 or 2 pumps. If it dropped to -20*C(-4*F,I think) it might take 2 or 3 pumps. And so on. Every engine is different. You will have to get to know yours.
It is very difficult to flood most slantys.
Sometimes I have splashed about an ounce or more straight down the carb,got in, cranked it with the pedal down about half-way, and just held it there while it sputtered to life, then backed off as the revs began to climb.In summer even,lol.
OK, let me rephrase that; all the slantys I have ever had the chance to test, were hard to flood, by excessively pumping the pedal. I think you will nearly pump the bowl dry before you flood it,lol. So....point is ; don't be afraid to pump that pedal. And when you do, it's
all the way to the floor!
But DON'T MESS WITH THAT ROD! if it runs good on the choke.
OK so good luck