Rob, Probably nothing wrong with the stromberg....
The mixture control DOES NOT HAVE AN IDLE CUT OFF POSITION. iT IS PROPER TO TURN OFF THE ENGINE USING THE IGNITION SWITCH. If the carb is running rich it is probably due to the mnixture control being stopped up. On top of the carb, you will find three screws (safetied) that hold the mmixture control assy in place. They can be removed with a 90 deg screewdriver if you are careful.... Slip out the assy, and you will find a disc with three different size holes. Clean the holes, and reassemble. I would expect this is the problem....not unusual. The air cleaner is inefficient especially if one does not "oil" it on annual. The other potential problem is a leaking float needle. I gasoline drips out of the carb with the engine shut down, then the float valve is leaking.... and needs to be replaced....The leaking float valve would allow excess fuel in the engine causing it to run rich, also...... Have to leak pretty bad to cause much of a problem, unless the engine is idled long periods.... Most coupe (stromberg ) mixture controls are wired "full rich", as leaning is only effective once you exceed 5000feet.... I hooked mine up so I could lean, but found I could not tell any differefnce in the altitudes I generally fly, so I removed the cable, and again wired it full rich..... It is a good carb, but no accelerator pump, so you should open the throttle slowly, to prevent hesitation. By using the igniytion switch to turn the engine off, you assure that the mags are not hot......I see that as a benefit, not a problem. Fly Safe - Have Fun Harry Francis 93530 Blacksburg, Va.
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