Sort of, the threads IÆm talking about are those that are just visible on the left hand side of the spark plug hole. These are the partial threads that extend beyond the threaded body of the spark plug. They just look like the type of place that would gather carbon over time. IÆd not expect any problems in the near future however over a period of yearsà Just one of those little things that kind of bug me. Too many years working on aircraft.