No, you're not really far off. The guy in the youtube video had different sprockets to lower the rpm's. I have stock gearing but a modded engine on a '94 ninjette. At almost any indicated speed in 6th gear I'll be running at about 1000-1500 rpm's higher then the speed indicated. So at 80 indicated I'm usually running close to 9500 rpms.
So, no your bike is ok.
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