Hi all thank you for all the responses to my querry. I took a mag off a friends plane in my hangar and installed it on mine and the problem went away. As I had also put on a new harness and plugs I new it had to be a mag problem even though all the checks my IA preformed detected nothing. I replaced the tower, points, and condensor. We restalled the mag and presto 38 rpm drop @ 1750 ???? The motor has never ran so well. :lol: