Scooterotica

My lammie is running quite well at present but the plug has a weirded pattern, light and dark in different areas. Indicates to me that all is perhaps not well in the head? As I say its running well, a little boggy at low revs but nothing that I can't live with and better that than too lean. Muggy 225.

Thoughts anyone.

Thanks

John

http://www.flickr.com/photos/91303085@N06/13006282085/

Difficult to tell from a photo but that doesn't look too bad, what grade is it?