I got a 2001 FZ with 27000kms on it.

I bought it used in stock trim and threw on a Yosh RS3 slip on with no carb mods. I mainly do alot of touring with it so I have been running 87 octane since owning it. I have never found a need to rev the bike past 7000 rpm but today I found that the engine cuts out and chokes over 7000 rpm under wide open throttle. Slow throttle to red line is possible but possibly lacking in power.

As far as I can tell, the carb jetting is stock since the fuel mixture caps have not been drilled out. Any ideas what my situation might be?