I have had another half gallon through the engine and I think the engine is running smoother now. It must be that the engine needs about 3 or 4 gallons to breakin.

I am switching off the engine by switching on the choke by a servo. I was told that this is not good for the engine. Is that true?

I am also finding a lot of black carbon soot on the spark plug. How do I clean it? Somebody told me it is due to my switching of the engine with the choke. Or is it due to the engine being run on the rich side?

I also find the engine harder to start after the first flight. Is it due to me wetting the spark plug too much when I switch of the engine by choking?

Haris