Be Careful With Coffee Grinder!
One thing you can do is, pull the clutch lever in/out in neutral when you first get it started. Then plunk it into gear and repeat the process, just letting the clutch engage slightly. I do this on cold starts and it eliminates the problem, avoiding surprises.
Have to be careful with coffee grinder syndrome, combined with 2 or 3 other things, it put me down on the asphalt once.
What can happen is, you start letting the clutch lever out, but the clutch doesn't engage. You keep letting the lever out, then the clutch fully engages all at once, like you tried to do a drag race launch. At that moment you will also hear the coffee grinder noise. Having the clutch grab like that unexpectedly can put you down on the ground.
When I went down, I also had earbuds in and music playing, so I didn't hear the rpm like I should. The bike wouldn't start moving so I raised the rpm while still letting the lever out. When coffee grinder kicked in, the clutch grabbed full on, and the bike leaped out about 20' from where I was left standing. The extended sissy bar hit me square in the back, but somehow I stayed on my feet. Sheared a couple of bolts off the sissy bar.
When this happened, it wasn't a full cold start. It had been ridden, then parked for an hour or two. They tend to cool down pretty quick.
I guess the the 3rd distraction was the 10 pretty girls playing basketball in the neighbor's driveway, and the fact that the bike wouldn't start right away and backfired a couple of times. I must have been hilarious to watch.
I ran some Seafoam in my oil (200 miles before oil change) for another problem, and coincidentally or not, the grinder syndrome isn't as bad as it used to be. Seems to have cured the other symptom too.