So I purchased a brand new 2019 Ninja 650 ABS about a month ago, and just rolled over 1800 miles last night. I'm new to street bikes, my motorsports experience is in the car world. Love the bike, been very happy with my purchase so far. Had the dealer do the first oil change at approximately 530 miles, as well as do a general new bike checkup.
I did a second oil change at approximately 1550 miles. I filled it to the top level mark with the bike held upright on level ground. If you tipped the bike a bit to one side it would go over the top line, tipping it the other way would go under. Figured this was okay.
After this 2nd oil change, I noticed that the oil had air bubbles throughout it (not just on the surface) and thought this was a bit odd. Figured it might have something to do with the gearbox and wet clutch churning it up all the time. But I had this nagging feeling that I might have overfilled the oil despite it being right at the top line on the sight glass.
So 200 miles later (~1750 miles), I changed it again. Now with the bike upright and level the oil is right in the middle of the two lines. It seems to run smoother and I noticed zero air bubbles in the oil, even after riding for several hours. There's still some bubbles on the surface but from what I understand this is normal.
Basically, I'm worried that I might have overfilled my oil and potentially damaged my engine (specifically my main bearings / rod bearings). Even though the oil appeared to be right at the top level when I changed it the first time. I rode the bike to redline on a regular basis during those 200 miles when it was at this level, merging on and off the highway frequently, as well as zipping through city traffic. I suppose I'm an aggressive rider (throttle) in this respect.
What do you guys think? Have you ever noticed any issues with filling the oil to the max line on these Kawi 650 parallel twin engines?