| 900SL Register and web page, excellent help there.
Having looked through the 900sl register website, I found it a great source of info, some really good examples out there.
My favorite is still the MK1 to be honest, the white frame and mavics just look right.
I also think that the superlight is the only duke that can wear yellow and look brilliant. I could easily have a red or yellow SL with no problem, not sure I can say the same about other duke models though.
Having had a MK1, MK3 and a MK5 , all great bikes, but the original still looks best . But that is like all dukes really, original bikes are allways the best.
well worth the look at the site etc, top marks to the man who set that up.
cheers
R | 
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