@byee,
@janpoko, et al.:
First of all, let's make sure we're on the same page, comparing apples to apples, and other such expressions.
That is to say, the top speeds I listed in this thread -- 86 MPH (138 KPH), after about 1,000 miles on the scoot, and 89 MPH (143 KPH), after about 4,000 miles -- were the speeds
as determined by a GPS (in my case, an 18 Hz GPS chip on the GoPro Hero9, and a 10 Hz Hero11 chip). These were NOT the speeds listed on the bike's display; those
approximate speeds (i.e., 2% - 3% higher than reality, per my observations) were, respectively, 88 MPH (142 KPH) and 92 MPH (148 KPH).
(To recap: the 86/138 figure is what's listed in my owner's manual as the top speed, and after the break-in period I thought I confirmed that. However, with additional mileage, I have now confirmed 89/143. And by "confirm," I mean using a GPS.)
So, are the speeds you folks are posting about GPS-determined speeds, or speedometer-listed speeds? If the latter, they're perhaps indicative of relative speeds, but not real speeds.
Next, I, too, had no problem getting up to those speeds, as you can see in my videos ... especially the last one (post #4), when I was on level ground, and just gave it some more throttle. Only took a few seconds to top out.
I hadn't really planned on this second test, but I noticed I was going pretty fast, had recently passed a LEO on the side of the road who was giving someone a ticket, and so just decided to wick it up. I still have to do a planned test again, with a second camera recording the display, and with the display set on Urban, to show both the speedometer and engine RPM display. I'm not sure I can get this in before the season ends for me, but I'll see what I can do.
(By the way, it bugs me that the RPMs are only displayed on the Urban setting. I usually run with the My Vehicle display, which has room for a tach readout. And which certainly doesn't need to display a picture of the scoot -- I know what it looks like. If some programmer is really proud of that bike picture, it could be displayed for a few seconds on start-up, and then disappear. But I digress.)
Last, I wouldn't worry at all about keeping the bike at top speed for an extended period of time. A friend of mine -- he and his wife were with my wife and me, when we did the Edelweiss "Tuscany by Scooter" tour this past May -- did an IBA "Saddlesore 1000" on his C 400 GT a few months ago: see
www.youtube.com/watch?v=mqo-P_uSO50, if you're interested in a quick overview he put up.
That's 1,000 miles in less than 24 hours (in his particular case, it was about 20 hours). He wrote to me afterwards, "I am convinced you can ride this thing W.O.T. all day long." As I say, I wouldn't worry about running a little faster than some of us run much of the time on highways. It certainly would be informative to see what the RPMs are at top speed, though.