Rough mag
in General Tech Discussion
8 years ago
One mag now runs rough during the mag check (old style ignition – early 80hp). Still within 50-125rpm of the other mag, and about 200rpm from both. But that one mag feels rough and the RPM varies up and down, up and down, when on that rough mag. All connectors have been cleaned and reassembled. If I switch red stator wires, the same mag runs rough through the mag check (the problem does not switch to the other mag).
But when I do a full throttle run for 10 seconds or more, and then return to 4,000 and again do the mag check, it usually is smooth and same drop on each mag as if the problem disappeared. I keep doing this again and again, and the results are the same. I’ve installed new plugs DCPR7E and gapped them .025”, torqued to 180 in-lb and this made no change.
I could always change my pre-flight by doing a full throttle run and then returning to 4000rpm and get good results, but I don’t think this is advisable.
Ideas? Perhaps further isolation by switching 4-pin connectors? What would that tell me?
But when I do a full throttle run for 10 seconds or more, and then return to 4,000 and again do the mag check, it usually is smooth and same drop on each mag as if the problem disappeared. I keep doing this again and again, and the results are the same. I’ve installed new plugs DCPR7E and gapped them .025”, torqued to 180 in-lb and this made no change.
I could always change my pre-flight by doing a full throttle run and then returning to 4000rpm and get good results, but I don’t think this is advisable.
Ideas? Perhaps further isolation by switching 4-pin connectors? What would that tell me?
