I can't believe how much the engine smoothed out.
I bought a 2018 Versys 650 new this past April. When I first started riding it, I noticed there was an unpleasant vibration around 4000-4500rpm. Not a deal breaker, but enough that I thought that rpm range should probably be avoided. Also, below 4000 was no pleasure either. Sure, work your way up through the gears, but when arriving at the desired cruising speed...anywhere between 25mph and 55mph....it's best to keep the rpm at 5000. 5k seemed to be a nice sweet spot. And 65mph is right at 5k rpm...and the bike is so smooth at that speed/rpm.
I changed the oil at 500 miles, and I switched to full synthetic.
The bike now has 2300 miles on it, and I can't believe how much the engine has smoothed out. That 'unpleasant vibration' at 4000-4500 is completely GONE! I'm so surprised this has happened. I don't know if switching to full synthetic contributes to this or not. This new smoothness has only come on in the last 600-700 miles or so. (or perhaps that's when I really started to notice)
I can now ride the bike at much lower rpm. As long as I'm holding a steady speed and don't need lots of power (like going up a hill), I can run the bike at 3000-4000rpm, and it feels fine. Heck, now when I get the rpm's up near 5k, I feel as if that's too high. (for steady cruising) I was originally going to consider the ECU tune from Shoodaben, but I don't think it's needed.
In my years breaking in new car engines...I've never noticed ANY difference in the feel of the car/engine. But I'm shocked at such a transformation on the Versys 650.