2003 883r with a newer SE clutch.

I just changed the trans oil about 100 miles ago. At first when I went into 1st gear, it was fine, then into 2nd was good, 3rd good and so on. It ran fine

Then it would go 1st to 2nd no problem, but then 2nd to 3rd it would go into neutral. I would have to downshift back to 2nd, let the clutch out and then re-shift to third. And it would go through the gears no problem

Now it will not even go from 1st to 2nd. It just hits neutral and that's it. I can downshift back to 1st but that's it.

I checked the fluid level and it is right on the line. I used the SE SYN3 fluid.

 

It's either the clutch basket adjustment or the gears are palled.
I use Redline in the Tranny and HD primary fluid in the primary.

 

Make sure your shift linkage is not binding somewhere.