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John, That
sounds like what I had happen once on my Coupe. Symptoms: After
flying high with the engine running smoothly, the engine ran rough after
descending. It was almost smooth
at full power. I only had 6-8
miles to go to the airport so I continued and landed on the airport. After you
check the easy things like the linkages and whatever else others here
recommend, you might want to do the following. Caveat: This only applies if you have a
Stromburg carburetor. The
Stromburg carb does mixture control by using a plate with multiple holes that
slides against another plate with, I think, a single hole. The multiple holes were drilled so
that, as you pull the mixture, the successively larger holes match up with the
fixed hole allowing more airflow through the hole. Under the
fixed hole is a tube that goes, I think, to the venturi of the carb and this
mechanism varies the air pressure in the float chamber and this controls the
mixture. In my
plane, the tube through the carb was clogged with fibers from the recently
cleaned fiber type of air filter (which I never used after that day). We cleaned
the tube through the carb, cleaned the moving and fixed plate, cleaned the
chamber in which the plates sit and reconnected the mixture. The mixture worked fine the remaining
time I owned the plane. I seem to
recall a recommendation that the two plates with holes be lapped together so
they fit together very well – I’m not just sure about this – perhaps rub them
together with lapping compound between them. Altogether,
removing the carb, disassembling it, cleaning, reassembling and remounting it
took about an hour and a half if I recall correctly. It was
really worth it. I used the
mixture control to good effect in many cross-country trips. You can see further discussion on
mixture in the paragraphs I wrote for the FAQ at http://www.ercoupe.org Ed Burkhead http://edburkhead.com/ [EMAIL PROTECTED] -----Original Message-----
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