He BCG,
looking really good so far, but i got some ideas for your progress.
The model looks to soft. Smooth forms would be ok considered the forms of the bike are very rounded, but i think the fairing is really to rounded. Frame and engine is looking really nice. Good Ref material can be found on
Bikewalls.com - Motorcycle wallpapers - free! They do have plenty of good pics in really high resolution. Be aware photograph aren't always perfect in the sense of orthognal images for modelling but they'll do.
Keep the work on this up. Nice to see somebody else thinking motorcycles are as easy to model as cars
P..: