Replacing the engine coolant isn’t something
you need to do often but if you do have to flush your coolant it’s a fairly straightforward
process. You’ll need a wrench, distilled or demineralized
water, replacement coolant and a container to capture the flushed coolant.
First, make sure you can access the radiator cap. This may mean removing some fairings
and the reserve coolant tank. Follow the hose from the radiator to the impeller
cover and remove the drain bolt. Make sure the engine is cold before you do this and
that you’ve placed your container under the drain.
Next, remove the radiator cap. Generally, you’ll need to first turn the cap counterclockwise
to the first stop. Then push and turn it in further in the same direction and remove
the cap. The pressure released from removing the radiator
cap will then allow the coolant to drain. Empty your reserve tank into the container
as well. Reattach the drain bolt with your hands, no
need to tighten it too much. To ensure you flush your system properly,
pour demineralized or distilled water into the radiator until it fills up to the filler
neck Remove the drain bolt again to empty the distilled
water from the system. An option here is to run
the engine for a few minutes to allow the distilled water to circulate before you drain it. Put your drain bolt back in, this time tightening it with the correct torque values as recommended
by your manufacturer. Pour your new coolant in, but do it slowly.
This reduces the amount of air that goes into the cooling system.
Do the same with your reserve tank, too. Replace the caps on both the radiator and
reserve tank and run the engine until the radiator fan turns on.
This will help any air trapped in the system work through into the reserve tank – note
the air bubbles. Let the bike cool down – the expelled air
will mean that once it has cooled, you’ll need to fill up the reserve tank slightly.
And do the right thing by the environment and dispose of your old coolant at a local
refuse or recycling centre.