Join Date: Jul 2015
Location: Belmont, NC
Year/Make/Model: 2006 Vulcan 900B
Color: Metallic Blue
I had a similar problem today but it failed completely on me so that I could not upshift at all. Same mild grind sound but would not shift. I'm going to tear into the clutch assembly over the next few days. Mine will shift from first to neutral and back, I checked the alignment marks on the shift shaft and they are still aligned so they have not slipped relative to each other.
Mine is an 06 so it is probably due for a clutch rebuild anyway. I'll start with that and then see where I'm at. If you're not mechanically inclined get a good shop to look at the clutch cable setting for slack and full engagement when actuated.