Gixxer Pulls right on wheelie

Hey, I got a 2001 gixxer 1000 about a month ago, It pulls heavy right when I try to pop a wheelie, sittings are worst that stand ups.

lets say im on the highway, I lift it from the left lane, and I have to let go after ~10 seconds cause i'm in the right lane heading for the railguard.... Its not a wind problem, ive tried many times wherever the wind is coming from or the grooves in the asphalt. I had a 750 before, never had that problem

I've aligned the wheels using a rope to make sure they are both inline. they werent, they were a little off, now its fine, but still pulls, im going to change the sprockets and chain on the bike next week, could that be the problem ?

thanks for your replys
Marc