Jon Woellhaf wrote:
"a" wrote in message
...
... Even on run up you lose some RPMs when on a single bank of spark
plugs.

If you don't get an rpm drop when running on a single mag, something's
probably amiss. My engine has never run rough during a mag check, except
when I forgot to lean aggressively before taxi and got lead fouling.


Long ago I had rented a C=150 that the run up mag check was fine before
a return flight back to the home airport (about 1 hour flying). All of a
sudden in cruise the engine was running rough. I did a mag check, on one
side was rough and the other side smooth. I elected to run on one mag
that was good and squawked the aircraft upon landing.

--

Regards, Ross
C-172F 180HP
Sold
KSWI