Just to add to my last comment. Somewhere in this topic i did weigh the mirrors and side stand. Both are heavy items and are worth replacing or removing.
I like peter used to be obsessed with trying to loose weight on the zx10r because the bike used to feel like it needed less weight.
The funny thing is i just bought a 2017 r1 and its got so much grunt and torque that weight doesnt become a factor, it just pulls effortlessly.
I actually get arm ache trying to hang on with the torque which is something ive never experienced before.
The zx10r weight isnt really its issue in my opinion its more the lack of torque. Id work on that area if i bought another one