I have encountered such mechanically unsympathetic people before, they are usually the ones with broken gearboxes, melted pistons, snapped chains and no idea why.
It is the type of person that puts dealers off offering test rides on their bikes and makes warranty claims have to be investigated so much.
I hope you are not talking about me, that would make no sense.
Did you notice the same problem with your GT 650?
Does it rev freely to 8000 RPM in the 1st gear or does it bog down at 7000 RPM before continuing to rise to 8000 RPM?
Thank you.
P.S.
Found a nice review, mentiones the same thing I see with my GT 650:
"Throttle response is smooth and linear, torque pulling you urgently from 2,000 to 4,000 rpm. Beyond that the engine delivers a guttural, lusty rush of power all the way to the 7,000rpm redline (although I’ve hit the rev limiter at 8,000rpm)."
So, where is the rev limiter? On my bike, the red line starts at 8.000 RPM.
https://wheels.ph/love-and-the-royal-enfield-650-twins/