How To Burp A Motorcycle Coolant System
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If you have cracked open the cooling system on a motorcycle, you might find that getting the air out can be tough. In this video, you will get an idea how to burp a motorcycle coolant system. I am using a Suzuki DRZ400S as an example of how to get the air out of the cooling system.
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Some cooling systems on motorcycles have a closed coolant reservoir bottle. Meaning there is no cap to remove to add coolant. In this video, I talk about how I used a large syringe to push extra coolant in the overflow reservoir. I did this to help monitor if the system needed anymore added or not. If you need a syringe, you can purchase one here:
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Most motorcycles have smaller lines and smaller cooling chambers withing the engine, thus making it easy for any air to cause the bike to overheat.
If you have replaced a cooling system part or just want to flush out the old coolant fluid and add new, you will need to know how to burp the air out. The method I used is much like on a car. With the radiator cap off, I ran the bike until it got hot. Once hot, I let it run for 3 to 4 minutes burping out air and coolant out of the radiator cap inlet. I then would let the bike cool for about 30 minutes, then top off the coolant level. I would then repeat the same process of letting it run and burp air out with the cap removed.
I then let it cool off again for another 30 minutes, top the fluid level off but this time put the radiator cap on, start it and let it get hot. I then found the bleeder screw on the other radiator, the one without a cap. I opened it up and let it burp out air and coolant for about a minute. Now the system has been bled of air. Let it cool for an hour and then remove radiator cap and top off coolant level. More than likely the coolant reservoir bottle will be low to empty. Using a syringe, I pushed coolant into the bottle until it was about a quarter way full. This is a good way to monitor if the system is still low on coolant. If low, when it cools after being hot, the radiator will suck up any left in the bottle. If it is about the correct level in the radiator, the overflow bottle will always stay about the same level.
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Check out my related videos:
Suzuki DRZ400S Not Getting Enough Gas – https://youtu.be/19IizOdxe-4
Honda 70 Not Getting Spark – https://youtu.be/oRQr-GGoZQ4
How Do You Repair Missing Threads On A Motorcycle Engine – https://youtu.be/Zxkm6t0hs5A
