What was found
THE ENGINE HAD BEEN INSTALLED AFTER OVERHAUL. OVERHAULER DID RUN-UP AND REPORTED THAT ENGINE WAS SATISFACTORY. COMPLETED THE INSTALLATION WITH NEW MOUNT, VIBRATION ISOLATORS, AND COMPLETE HOSE KIT. TEST RAN ON THE GROUND FOR .7 HOUR WHICH GAVE SATISFACTORY RESULTS. APPROXIMATELY 10 SECONDS INTO FIRST FLIGHT, VIBRATION WAS ENCOUNTERED. FLOW CHECKED NOZZLES, ONE WAS CLOGGED. CALLED OVERHAULER ABOUT PROBLEM AND RECEIVED NEW NOZZLE. OPERATION SINCE THEN HAS BEEN SATISFACTORY.