Letter corresponds to model year, (J1 is 2000) You can tell what bike you have from the frame number.
As far as differences from 00 to 02 I don't think there are any. Paint job changed a little. For Europe 02 was available in 636cc engine.
What are if any the major differences in the years 00 to 02. Also I have read that some of you call your bikes by letters and numbers (like J1) what does this mean and is there a list someplace or could ya jot em down.
I know from 99 to 00 the engine got a lot of tweaks to it, and somewhere in that area the subframe became a bolton rather then a welded on piece.
the bulk of the frame was the same I think, and most of the fairings too (other then the nose)
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