Found a few threads for other bikes. This is one guy that adjusts his every oil change on his GXSR.
You need a carb sync tool in order to do this, motion pro makes a good one:
http://www.motionpro.com/motorcycle/tools/syncpro/
Its kinda easy to explain if you have worked on your bike before.
1) Prop up the tank and remove the air box. Here is the Spark Plug DIY, it tells you how to do remove it:
http://www.gixxer.com/forums/showthread.php?t=114103
2) Unplug the vacuum sensor (SEE PIC). On the bottom of this sensor you will see a piece of tubing, from this tube it will branch off to the throttle bodies, these are your vacuum hoses. Remove the VACUUM hose from each throttle body. FYI There are 2 hoses on each throttle body, the vacuum tube is the LOWER hose.
3) Replace the VACUUM tubes you just unplugged with the tubes from the sync tool, 1 per throttle body.
4) Start the bike, you will have an FI error, its ok, let the bike warm up. Once its warm adjust the idle to around 1500-2000 RPM, using the idle adjustment screw. Furing this entire process try not to REV the bike too hard because you will suck fluid into the throttle body (bad joojoo).
5) Adjust the throttle body using the small GOLD adjustment screw located on the top of the throttle body (SEE PIC). What you want is the vacuum pressures to be even across the tool. So adjust each one to make this happen. If only one cylinder is out of sync, then just adjust that one first. Keep in mind though, if you adjust one the others might move too, so its a balancing act. Dont get frustrated, just keep making small adjustments and eventually they will all even out.
6) Once your done, replace the vacuum tubes and plug in the vacuum sensor, replace the air box and its tubes, put everything back together that you took off. Start the bike again and enjoy.
More threads
I use a Carb-Tune II. NO fluid. Anyone who has used it will swear by it. Real easy to do. Use it twice and you've already saved yourself some money
I still hanv't looked into this for the 9 yet, but I will.