What was found
THE AIRCRAFT ARRIVED FOR 100-HOUR INSPECTION. COMPRESSION CHECK SHOWED NR 4 CYLINDER 55/80. ALL OTHER CYLINDERS WERE IN THE MID 70'S. THE CYLINDER WAS REMOVED. EXHAUST VALVE AND SEAT WERE WORN EXCESSIVELY. THIS IS A FACTORY RE-MANUFACTURED ENGINE. ALSO, FOUND, EXHAUST GUIDE WORN EXCESSIVELY, CYLINDER CHOKE AT MINIMUM SERVICE LIMIT, AND CYLINDER .0015 INCH OUT OF ROUND. ALL OTHER CYLINDERS APPEAR TO BE NORMAL.