Hi all I put new pipes and new spark plugs on my 1300/07 about 200 miles back. I have one plug that is about 75% of it is a nice tan in the porcelain area r/f plug. The r/b is just starting to get black and tan about 1/8 dia area. The other two are white in the porcelain area. All the side electordes are gray/tan. My ? is how many miles should be on the eng before you can tell how its doing. The org plugs are mostly black with some tan like it was to rich at break in.