I had a street twin but I sold it. What was in the car was an aluminum flywheel with a McLeod disc and Long type clutch. I am using Redline MTL fluid so that could be part of the issue.

I think it is a synchro problem. When I try to shift the shifter will move out of gear easily but it feels like it hits a wall before it goes into the next gear. The shifter hangs up for a half second and then it goes into gear. I cannot shift it quickly, it just hits the wall and then after a moment it goes into gear. So the synchro is probably not spinning up to speed. Changing the fluid would be an easy fix so I'll try that.