I recently replaced the exhaust stack on the pilot's side of the engine. Since that time, the engine seems to be backfiring when I close the throttle to land. I checked it today and the backfiring seems to start between 70 and 65 mph. The A&P has checked everything he can think of and has no idea what is causing the problem. I was flying with the canopy closed and wearing a headset today and even with my poor hearing it seemed disturbingly loud. Any opinions welcome.
John Roach N 2427H
