Carburator adjustment

[Msaby]

I now have the engine running and would like to adjust the carburator properly. I have a tillotson carburator which I have throughly cleaned and replaced all the necessary pieces. I made sure the intake flange surface was flat. I think I understand how the fuel adjustment in the cab should be set, off, 1/8 or 1/4 turn when warmed up but I am unsure how to adjust the other mixture screw.

Many years ago when I worked in the garage we would put a vacumm gauge on an engine and adjust the carb for maximun vacuum. Can I still adjust this way?
I spent several hours searching the forum for carburator information but it appears the Zenth carburator is more common.

Any advice is greatly appreciated.

Thanks
Mike

 

[Patrick L.]

Both mating surfaces of the body need to be flat also and they can be filed to fit. They seem to run best at about 1/4 to 1/2 turn out on the GAV. As for the idle mixture, just set it a about 1 turn and then turn each direction until it starts to run worse, then split the difference. You'll hear/feel it.
Did you get the passages clean ? Usually the main jet needs to come out to make sure the 2 transition ports are clean and that jet does not want to come out on some and needs to be drilled out and replaced.