Low power full throttle mid rpm

[Ministras]

Hello again everybody, a few days ago i completed my driving exams (hurray) and took my bike for spin. It was amazing as it should have been, but i ran into some problems (as it shouldnt have been). At around 6.5-8k rpm at full throttle the bike seems like it almost cuts fuel off. Then at 8k right at the power band the bike flies all the way to max rpm. It seems to happen at 2-3rd gear, too scared to try first and not enough space to go 4+ gear  :o .


So what are your suggestions? Last owner didnt winterize the carbs, are they the problem? How can the power stop, then come on at full force later?