Re: White spark plug.
What number ( heat range) is the spark plug? If it is too hot it can burn off the color imprint you are looking for.
I don't want to assume nor do I want to offend you but I need to ask, are you positive it was 4 stroking and not actually surging?
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."