As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT HESITATION DURING CLIMB. HIGH POWER SETTING. ENGINE CYLINDERS #2 AND #4 WERE REMOVED AND SENT TO THE OVERHAUL SHOP POPLAR GROVE FOR REPAIRS. BOTH EXHAUST VALVES WERE STICKING. CYLINDER SHOP REAMED VALVES. THIS CORRECTED THE ENGINE HESITATION ISSUE.