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I have a 2009 Suzuki Burgman 650A and am having a problem with it over heating. I replace the thermo switch which was bad, have checked the thermostat which is good and have cleaned the radiator fins. Could it be the water pump or the chain that drives the oil pump which also drives the water pump? I have little mechanical knowledge so can use all the available knowledge. Thanks.
 

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Are hearing the radiator fan kick on ? Does it sound Healthy ?
 
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Discussion Starter #3
Are hearing the radiator fan kick on ? Does it sound Healthy ?
Yes, fans runs perfectly. No leaks anywhere. Clean radiator, tested thermostat, replaced thermo switch, hoses are all good. How can one tell it the water pump is bad?
 

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I’ll let Dave_J or LeDude jump in .....I remember reading you need to burp the radiator after refilling...Edit now I know this is important.
 

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when I had my over heating saga, it was due to a bad thermostat, however it can also be the water pump which I had to rebuild due to an oil leak.

you basically want to make sure that there is no blockage in the coolant circulation cycle, clean and clear tubes all around

if you have not checked the thermostat, I would take it out and check it, rather easy to do

Thermostat Replacement

Water Pump Repair

90467
 

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Discussion Starter #6
I’ll let Dave_J or LeDude jump in .....I remember reading you need to burp the radiator after refilling but I don’t think that would be causing all your problems.
No leaks or weeps. As I mentioned earlier the thermo switch was bad and I did replace it. I tested the thermostat. It's working perfectly. By the way, coolant temperature was hitting the red line. I shut it down as soon as I noticed. I wonder if the overheating because of the bad thermo switch damaged another component in the cooling system.
 

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LeDude Replied, your in good hands now
 
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If there is air trapped in the system it will cause over heating. There is a procedure for 'BURPING' the air out. It may take 2-3 tries to get all the air out.

Snipped from LeDudes page:

11.Fill the system with 1100ml of new coolant and bleed the system of any air bubbles by slowly and gently rocking the scooter from left to right a few times.
12.Start the scooter and let it run until you see a few bars on the coolant temp indicator.
Repeat process a few times, and try to bleed more air of the system by rocking the scoot and watching
the coolant until it is free of air baubles.
Add coolant if you see the level drop on the radiator.


13.Replace the radiator cap tightly, (twist to the right).
14.Take the scoot out for a short ride.
Let it cool down and double check the coolant level.
Repeat #12 as needed, add coolant if necessary.

I added the highlighted "Repeat #12 as needed" to #14

Also it is VERY important that the thermostats air jiggle port is at the top when installing. This allows air to bypass the shut cold thermostat. It is a small port so let the bike sit awhile between steps #11 and #14

thermo 19.jpg
 

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Discussion Starter #9
If there is air trapped in the system it will cause over heating. There is a procedure for 'BURPING' the air out. It may take 2-3 tries to get all the air out.

Snipped from LeDudes page:

11.Fill the system with 1100ml of new coolant and bleed the system of any air bubbles by slowly and gently rocking the scooter from left to right a few times.
12.Start the scooter and let it run until you see a few bars on the coolant temp indicator.
Repeat process a few times, and try to bleed more air of the system by rocking the scoot and watching
the coolant until it is free of air baubles.
Add coolant if you see the level drop on the radiator.

13.Replace the radiator cap tightly, (twist to the right).
14.Take the scoot out for a short ride.
Let it cool down and double check the coolant level.
Repeat #12 as needed, add coolant if necessary.

I added the highlighted "Repeat #12 as needed" to #14

Also it is VERY important that the thermostats air jiggle port is at the top when installing. This allows air to bypass the shut cold thermostat. It is a small port so let the bike sit awhile between steps #11 and #14

View attachment 90468

I removed the water pump. Can't find anything wrong with it. Gotta a couple more hose to check. I have a new thermostat to install. Don't know of anything else I can do. Sure hate to reassemble and it doesn't work. Will it be okay to start it with all the tupperware removed?
 

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I removed the water pump. Can't find anything wrong with it. Gotta a couple more hose to check. I have a new thermostat to install. Don't know of anything else I can do. Sure hate to reassemble and it doesn't work. Will it be okay to start it with all the tupperware removed?
Yes you can start it without the plastics on....Please Burp the Baby as Papa_J instructed .
 

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Discussion Starter #11
It's me again. Is there a test kit that will check for exhaust gas in the coolant? I don't think there is a problem but just to be safe.
 

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Did you Burp It a couple times ?
 

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dawn dish soap,,,, TIIINY BUBBLES :)
 

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Discussion Starter #15
Still waiting on thermostat. Also decided to replace water pump. Whatever the problem is or might be I don’t want to go there again


Still


still

Still waiting on thermostat. Also I decided to replace water pump. Whatever the problem is I don’t want to go there again.
Having a problem posting.
 

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Maybe I missed it, so I ask, how do you know it is actually overheating? Is it pushing coolant out the overflow can?

One cause of hard to find overheating is from leaking head gaskets. You can rule this out by starting the cold engine with radiator cap off. If you have a leak it will blow coolant out. If all’s good you should only see a small flow across the top of the interior tubes from the bypass hole in the thermostat ( assuming you can look in)
 

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A sign of over heating (besides having all temperature bars showing) is that when you stop the bike but with the key still “on”, you should hear the cooling fan kick in or still running if it kicked in while you were still riding and you will hear it cut out when the fan cools the water/antifreeze down enough.
 
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You can test the old thermostat by putting it in a pan of water bring to the boil and it should open.
Is your rad full, is the expansion bottle at the high level mark, have you got a 50/50 coolant mix, is it good or tired old coolant change it if more than 2 years. Fan should kick in when coolant temperature nudges 4 bars. Is the Rad cap good. Check the oil filler cap for creamy deposits if there are any suspect head gasket.
 
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