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How To Flush Your Motorcycle Coolant – Change Motorcycle Radiator Coolant

How To Flush Your Motorcycle Coolant – Change Motorcycle Radiator Coolant


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.

17 thoughts on “How To Flush Your Motorcycle Coolant – Change Motorcycle Radiator Coolant

  1. Short, sweet and to-the-point. Love the brevity. Too many YouTube videos are more than 5 minutes or even 10 minutes long, and filled with fluff. I'm now confident I can flush the radiator on my '15 Versys myself w/o any trouble, after watching this video. Cheers!

  2. Thanks mate, just flushed my 2010 Versys 650. Green out, distilled water rinse, blue in! Heading to the recycling tomorrow. -Manchester, UK.

  3. 60/40 as in 60 percent water is best. You can buy 50/50 then add a small amount of bottled drinking water to the mix. Bike engines tend to run a bit hot so the extra water helps a bit. Try to shy away from using tap water with any pre mix. Tap water usually has a bit more minerals and iron in it than well water which usually doesn't have any long term effects. Bottled water added to the mix or distilled water works best for not having long term issues. If you don't know whether or not your water is good. Then poor a glass of water and leave it alone for two days. If you get a strong orange tint and or small white and blue rings keep it away from your bikes engine. Those metals and minerals do build up and can cause problems over time. Happy riding guys.

  4. So another video showed that the clear plastic tank was a overflow so I emptied mine dry. Now I need to open it back up and fill it? I hate removing fairings so much

  5. is car coolant the same as motorcycle one? I have a blue colour ethylene glycol coolant should this be okay to go into my yamaha mt07? Pls help

  6. Help. I spilled my coolant accidentally from the reservoir and a bit came out from the little hose… Will the air come out after I add some new coolant?

  7. Do you need to replace/restore the radiator cap when you run the bike with just the distilled water in (after emptying old coolant) for the flush?

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