George
I had noticed that there was quite a bit of oil on the prop so thinking it could be the 2stroke oil, I bought some new 2stroke oil and fuel cleaned the old plug (glass bead blasted it) put it back in and ran the engine up for 5 mins to clear out the carb, still got a bit of oil on prop, cleaned it off ran again for 5 mins and didn't notice any more oil on it. Hopefully this may have cured it. It was too misty for a fly but will try on next good day. Gaz