Originally Posted by
Forfoxake
No mixture control on a C90. Is that not unusual?
My C90 had a Stromberg carb when I bought it, no mixture control, just an idle cut off.
It was fouled up, sticking/deformed needle valve etc , so changed for a Marvel Shebler? With a mixture control.
However, plugs run awful black so this thread interests me. I too was taught to leave the red knob alone.