Also, not mentioned, is an air bleed hole located on the left hand side of the cylinder head I don't have a picture, but it's the only water hose on the head. It is, like the water pump drain bolt on the R/H side. Both take an 8mm socket to remove and both have shinny hex heads. Remove both bolts during draining and flushing procedure. Flush only with Distilled water until both holes are squirting clear water.(At first you will be getting green.) Then in the refill pour the 50/50 coolant mix into the radiator ( with both plugs still out), until the clear water turns to green coolant again. Then replace the air bleed bolt and the drain bolt. (do not over tighten, just very smug) Then take the bike by the L/H handle bar grip and the grab rail and rock the bike on it's center stand 5 or 6 time, back and forth . The idea is to dislodge any air pockets trapped in the cooling system. Don't be to gentle on the rocking. Next just crack the air bleed hole until you see a trickle of coolant. Then re tighten the Bolt. Next take it for a test ride. The heat gauge should remain about 1/2 way. If it starts to rise above that take it home pronto , without letting it get too hot. Repeat the shaking, as you didn,t get all the air out. After system has completely cooled, remove radiator cap and top off. You also have to suction all the old coolant out of the overflow plastic container located under the L/H foot pad and refill it w/50/50 coolant mix. Not nearly as hard as it sounds. Good luck.
Mac