Underneath my rear seat, there's a little bottle. It doesn't have any fluid in it :/ What's the bottle for?
Headlight fluid. <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: --> Umm. I know theres an excess coolant container on the right of the bike, next to the seat. There's also a brake fluid reservoir. But under the seat is pretty much just the battery and other electrics. So if it's not the excess coolant or brake fluid.. ¯\(°_o)/¯
I theink the 2kr's is under the seat but not to sure if it is your header tank you need some thing in ther ie coolant
Check to see if there's a hose going from it to the radiator, near the cap. When water heats it expands and thus fills the bottle, when it cools it flows back. The bottle is like an 'excess catcher.' It's a pretty good idea to have your coolant bottle filled up a little, so the water can mix and easily flow back to the radiator when needed. Fill it with 50% coolant concentrate, 50% water. If theres no hose going to the radiator, then I repeat ¯\(°_o)/¯