Hi all,
today I made a 70mls roundtrip. After this run I checked the spark plugs.

The #1,#2,#3 spark plugs looked like this:
http://www.bilder-hochladen.net/i/m0et-1-6e50.jpg

The #4 and #5 looked like this:
http://www.bilder-hochladen.net/i/m0et-2-9010.jpg
(Slight off focus, but the colours are ok)

And #6 was this:
http://www.bilder-hochladen.net/i/m0et-3-5429.jpg

I am a bit puzzled about the cause for such a difference. Any suggestions?