Glen;
First thing I'd check I that the mags are firing the correct plugs. The left mag should fire all the lower plugs and be timed at 30 degrees. The right mag fires the upper plugs and is timed at 28. If each mag fires 2 upper and two lower plugs (a la Lycoming), the one that's more advanced will have less drop. John Cooper Skyport Services 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 www.skyportservices.net _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Glen Davis Sent: Friday, October 03, 2008 9:37 AM To: [email protected] Cc: Geoffrey Davis Subject: [ercoupe-tech] mag issue Gang I recently had my C-85 topped with brand new cylinders. The plane has 4 hours since the top. The mags were timed at the time of the top. Since the top, I get a normal drop on one mag, about 60, but the other mag only drops about 10 RPM (measured on a digital tachometer). Any ideas why this is happening? Thanks Glen Glen Davis 917 297 1111 www.ishootpictures.com www.ercoupepilot.com
