As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOW POWER AND VIBRATION ON TAKEOFF AND ABORTED TAKEOFF. CLEANED GASCOLATOR AND AGGRESSIVELY FUEL TANKS AND BELLY SUMPS. NO WATER WAS PRESENT. VERIFIED PROPELLER TORQUE AND CHECKED DYNAMIC BALANCE DUE TO A RECENT PROPELLER INSTALLATION. PROPELLER VIBRATION INDICATED -GOOD- ON DYNAMIC BALANCE. CHECKED ENGINE COMPRESSION, MAGNETO TIMING AND SPARK PLUGS. ALL WERE NORMAL. RUN-UP AND FLIGHT CHECK SATISFACTORY.