Need a little help with a tilly

[rudvirus]

My tilly carb I cant find a diagramed of the carb to know which of the screws is for what to adjust the timing of the carb. All the ones I have read say adjust this screw or that screw, but it doesn't say where that screw is.

[mrtexas]

https://sites.google.com/site/mrtexa...ly-carburetors

[Patrick L.]

There are only 3 adjustment screws.
The GAV is the main adjustment and this things run best with it turned out from lightly seated at about 1/2 to 3/4 turns. The GAV is also the choke rod.
The idle speed adjustment is the little screw that sets the the throttle plate.
The idle mix adjustment is the little screw in the front the carburetor barrel/venturi and is an air adjustment.

[rudvirus]

Originally Posted by Patrick L.

There are only 3 adjustment screws.
The GAV is the main adjustment and this things run best with it turned out from lightly seated at about 1/2 to 3/4 turns. The GAV is also the choke rod.
The idle speed adjustment is the little screw that sets the the throttle plate.
The idle mix adjustment is the little screw in the front the carburetor barrel/venturi and is an air adjustment.

would the idea screw be the top one?

[Tom Wesenberg]

Originally Posted by rudvirus

would the idea screw be the top one?

The idle speed set screw would be the screw that is on the side and sets against the throttle lever to set the opening.

The idle mixture screw would be the uppermost screw at an angle of about 45* and controls the air to gas mixture.

I had the Zenith original carb in mind. I see 1955cj5 has given you the right answer below.

[1955cj5]

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If you have a Tillotson (tilly?), the idle mixture screw is accessed from the side...where the pencil is pointing

[rudvirus]

thank you so much for info