As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED DIFFICULTY STARTING THE AIRCRAFT. UPON INSPECTION TEETH WERE NOTED TO BE MISSING OFF THE STARTER RING GEAR. THE ASSEMBLY WAS REPLACED. THE STARTER DID NOT HAVE ANY DEFECTS ON THE DRIVE GEAR, AND WAS NOT REPLACED. ROBINSON KNOWS THERE IS A PROBLEM WITH THE STARTER RING GEARS. THEY HAVE CHANGED THE BRANDS OF STARTERS INSTALLED AT THE FACTORY FROM B&C TO SKYTEC. THIS AIRCRAFT HAS THE B&C STARTER INSTALLED.