Plug fouling on one magneto only?

[59pacer]

Flew a CAP10 some years ago quite a bit, what a sweet flying airplane.

The CAP must have inherited the Emeraude's handling. I fly the Emeraude for it's wonderful handling, the Acro II for some 'yank and bank', and the Pacer for going places. Lucky for some!!

[Steve Pierce]

I flew the factory CAP10C into Oshkosh one year for the factory and the controller called me an Emeraude. I remember thinking "this guy knows his airplanes". Through some contacts I had at the FAA I was able to get the C model (carbon spar carry through) added to the Type Certificate Data Sheet.

[59pacer]

I removed the air box to get access to the Venturi(2 piece). It wasn't loose. I could then get better access to the idle mixture screw and found it was over 2 turns out when the manual says it is normally about 3/4 to 1 turn out. As the idle jets are at the rear of the carb, I imagine that it would be feasible for the rear cylinders to run quite rich. After putting it all back together and doing the idle mixture/ idle RPM adjustment tango, the idle is set up perfectly with the screw about 1 turn out. Run up is now normal, and after a short 10 min flight the carbon fouling on the #2 upper plug was almost nonexistent. I'll do another longer flight in the morning and pull the plugs again, but I suspect the issue is resolved.
Thanks for the input.

[59pacer]

I flew the factory CAP10C into Oshkosh one year for the factory and the controller called me an Emeraude. I remember thinking "this guy knows his airplanes". Through some contacts I had at the FAA I was able to get the C model (carbon spar carry through) added to the Type Certificate Data Sheet.

There was always some doubt in my mind as to what model my Emeraude was. It first flew in '64 and there have been various model numbers attached to it from the official CASA registry down through various owners. I found someone at the registry in Canberra who was able to access the original airworthiness paperwork in Sydney and that revealed that the original plans showed Piel Emeraude 100, so the registry has been corrected--as have my personal details on the forum.