A Magnum or SC 75 would be pretty much the same but they have been discontinued also.

The High speed needle runs at about 1 turn. Don't know about the low speed. The needle in the center of the throttle arm is the low speed and the one on the other side of the carb is the high speed.

There is a idle speed adjusting screw on the back side of the carb and on this version, I think it's kept in place by a jam nut.

Enjoy,

Jim