I have rebuilt my engine and it has been running for about 3000 miles. Everytime I checked the spark plugs they have a white dusting on them that covers the spark plug tip. But if you whipe the dusting off it, the spark plug tip has the perfect tan color. Is this ok? Thanks for any help.

 

I will just bump this once, because I am worried if I am leaning the motor to much. Again thanks for any help.