Reply To: Mercury KG7Q

[Aidan Smith]

That’s possible. I haven’t replaced the condensers, but I did find that there was a slight oil slick on the underside of the magneto rotor, which makes me question an old fuel leak or a bad top crank seal. I will try condensers first. It has the Bendix Scintilla mag, and it was running poorly on one cylinder for awhile, and then I cleaned and reset the points.

The only other question I would have is the fact that it ran great for 10 minutes or so before the backfiring started. It was like a switch flipped, rather than a slow change.

1952 Blue Streak "B-Stock Runabout" - 1952 Mercury KG7Q
1955 Feather Craft Vagabond - 1956 Mercury Mark 55E