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My Father's 57 Ford 800 series tractor had been running like crap for awhile so I rebulit the carburator. Before it would smoke, foul plugs, die all of a sudden, wouldn't idle , was really loud ,etc.
After rebuilding the car, I set the adjustment screws one full turn out like the mediocre instructions that came with the rebuild kit said to.
The tractor started right up. He ploughed with it all day. I didn't even make any adjustments to the carb!
He said it ran great and ran tens times better than what it did before.
While he was doing this, I noticed I had left a piece out of the carb. I took this part to the tractor place and asked, "What is it and do I need it?"
They told me that it was the venturi and asked how the tractor mangaged to run without it. I said, I don't know but I do know it runs much better than what it did before.
I was afraid to tear into the carb again, you know ,"if it ain't broke don't fix it".
So I went home, took the carb apart and installed the venturi. Afterwards the tractor sputtered and blew black smoke out the exhaust. I backed the screws all the way out but this did nothing.
So I took the venturi out again and now it runs fine. This time I did have to turn the idle mixture screw out about a 1/2 turn before the tractor smoothed out.
One thing that I have noticed is the fact that even when the tractor is warm, you still need to use the choke where as after the rebuild it would start "warm" without it.
This may be because I reused the gasket that goes between both halves and the intake to carb gasket.
I assume this means the mixture may be a little too lean or it hasn't warmed up enough.
Also there are three adjustment screws on the carb. One is called the idle mixture (fuel) , one is the air and one is called power.
I know this sounds crazy but how do you set these things? I am a fuel injected man and deal with carbs very little (just the opposite from most people).
Also how come the tractor runs like crap with the venturi in the carb but will run great without it.
Do I need to make new gaskets?
Also I didn't remove the power adjustment needle not knowing what it was. Should have read the instructions better. What does this thing do?
Should I worry about having to use the choke to get the tractor started when warm?
Anybody out there that has worked on these tractors please get in touch with me because the IT shop manual I have isn't worth a crap when dealing with the carburators.
Thanks.
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