getting air in is not a huge problem, cause you can get it out easily.
To drain my coolant, this is what I did.
-before you begin, find out how much coolant is supposed to be in the bike, for the 2000-2002 I belive it is 2.2 or 2.3 liters... Make sure you put the same ammount back in again.
-make sure coolant is not hot! dont do this right after riding! having it warm is good, but not hot!
-right at the coolant pump, which is on the left side right in front of the front sprocket guard, loosen thelowermost bolt. It has a washer-type ring on it. You should see a couple drops of coolant come out if you got the right one, but the coolant won't flow because there is still a vaccuum sorta thing going on.
after making sure you have something to catch all the cooland below the hole you just opened (set it back half a foot, it will arc pretty far) Now remove the radiator cap, and the coolant should start flowing from the hole you opened earlier.
Once it stops coming out, there still be some left in the big hose coming out of the bottom of the pump, so you can disconnect that hose at the pump, and drain it out.
Now you can fill it back up, it is a good idea to flush it once or twice though, pour distilled water into the top of the rad, and keep doing that until you the liquid coming out the bottom is mostly clear.
When you fill it, use only distilled water, not tap water, and mix it will the coolant. Make sure the coolant you use is OK for bike and aluminum radiators. I used a 50/50 mix, but depending on the temperatures where you are, that might be a bit different.
If you can't get the full ammount back in, you probobly have an air bubble. Just turn on the bike for a minute, and it should work itself out, allowing you to add more coolant.
Make sure as well as filling the radiator, you also need to fill the resovoir back up as well.
-=Welcome To Canada=-
2002 Green 6R
1986 Gixxer 7/11