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I think if you follow the hose out of the bottom of the radiator it should hook into what looks like a solid piece of pipe under the frame of the bike. The drain plug is located on this piece of pipe. Haven't laid eyes on this myself, just going from what the exploded view in the manual shows. Need to do this myself before spring comes around again.


85 Posts
It is a little more than just a drain plug, you will need to pull the gas tank. I'm going to send you a link to the manual so you can download it.

From the manual:
Coolant Change
To avoid burns, do not remove the radiator cap or
try to change the coolant when the engine is still
hot. Wait until it cools down.
Coolant on tires will make them slippery, and can
cause an accident and injury.
Since coolant is harmful to the human body, do not
use for drinking.
•Place a container under the radiator drain bolt [A], then
remove the drain bolt.
Periodic Maintenance Procedures
•Remove the fuel tank (see Fuel System chapter). •Remove the radiator cap [A] in two steps. First turn the
cap counterclockwise to the first stop. Then push and turn
it further in the same direction and remove the cap.
○The coolant will drain from the radiator and engine.
•Suck [A] the coolant with a hose and pour the coolant
into a suitable container. •Install the reserve tank.
•When filling the coolant, choose a suitable mixture ratio
by referring to the coolant manufacturer’s directions.
Soft or distilled water must be used with the antifreeze
(see Specifications in this chapter) in the
cooling system.
If hard water is used in the system, it causes scale
accumulation in the water passages, and considerably
reduces the efficiency of the cooling system.
Water and Coolant Mixture Ratio (when shipping)
Soft Water : 50%
Coolant : 50%
Freezing Point : −35°C (−31°F)
Total Amount : 2.6 L (2.5 US gt.) •Tighten the drain bolts.
Torque - Coolant Drain Bolt: 9.8 N·m (1.0 kgf·m, 87 in·lb)
•Pour the coolant into the radiator.
○Pour in the coolant slowly so that it can expel the air
from the engine and radiator.
•Check the cooling system for leaks.
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