bike problem?

[liquid_spec1]

hello.
I just a cencern for my bike
its 2003 kawasaiki ninja zx6rr, it has 1600 miles on it with a micron exhaust.
last time i rode the bike is about 2 months ago, but i decided to go ride on it with a buddy of mine.
and the problem is the bike feels very hesitant.
1st gear when i ripp it, the tone of the bike sounds like a WRX, and the tone changess agian to what Iam used to. it will start pulling hard.
and in 3rd gear untill 7000 rpm it will be hesitant, and it will start pulling aigna...
Im thinking its something that has to do with gas. I never done a oil change since i got it from wow motorcycles. ( it only had 600 miles when i got it. now i have 1600),
please let me know what you ugys think,
oh and also, i always put in premium gas.
thanks

[mumbles]

you definately need a fluid change. but did you put the micron exhaust on there? b/c if so you probably need to get the bike remapped for the exhaust. also as gasoline sits it looses a little so depending on how long the bike it may just be old gas.

[DRFTR]

hey man pm me and if you want i can take a look at it for you...i work on bikes alot as well on the side so just pm me if you want me to take a look at it for ya.
-dave

[con]

wow, '03 with only 1600 miles??? was it properly broken in?

[liquid_spec1]

yea, it is properly broken in.
I never ripped it unitil i had 1200 miles.
anyways thanks for the advices, imma try it this weekend.
ill let you guys know what the problem were.