In article ,
Cubdriver usenet AT danford DOT net wrote:

On 15 May 2007 14:35:47 -0700, "Robert M. Gary"
wrote:

In the C140, the Aeronca, and the J-3 the carbs (probably all
Stromburg), pulling the mixture all the way out at idle had no effect
at all on the engine.

I fly a J-3, and I've never seen one with a mixture control.

That's because the carburetor is hard to find now a days.
The ones that out there in the fly markets are high priced and are
pretty much junk. The people selling them are hoping to find a sucker
that only has the model number and doesn't know what to look for.
I am still looking for one to put on a 7AC Champ.