As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARBURETOR ACCELERATOR PUMP STICKING OR BINDING CAUSING EXTREMELY DIFFICULT THROTTLE OPERATION. THIS WAS A FACTORY REMANUFACTURED ENGINE WITH A NEW CARBURETOR. TIME IN SERVICE IS 23.0 HOURS. THIS HAS OCCURRED ONCE BEFORE ON THE SAME MODEL CARBURETOR, ON A DIFFERENT ENGINE AND AIRCRAFT. SUBMITTER RECOMMENDS INSPECTING ACCELERATOR PUMP AND THROTTLE SHAFT FOR FREEDOM OF MOVEMENT AND PROPER TRAVEL BEFORE INSTALLATION.