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July 15th, 2007, 10:13 AM   #1
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Bleeding the cooling system

IHMO,

I have come to find that it is a good idea to bleed your cooling system on a regular basis. It only takes a moment, and I have found that there is usually just a smidge of air under the bleed screw.

If you boil the bike over, you really need to bleed the system. You'll be amazed at how much air is under the screw after a boil over.

I noticed a month or so ago on next years Husky 250 there is a small bleed line attached right at the top of the impeller housing. I'm assuming this is to purge any air that ends up there, which I'm also assuming is the top of the system.

Since I am not losing any coolant I would imagine this air could be coming from some cavatation at the water pump, or maybe just a bit of film boiling in the head area.

What do you guys think?
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July 15th, 2007, 07:08 PM   #2
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I had my bike heat up on me today while riding slow waiting for my wife. I need to bleed the air from the system tomorrow. Can you explain how to do this. I see the bleed screw between the exhaust outlets on the head. Do you bleed while running, or while hot or cold? The guy I bought the bike from had fitted the overflow tank under the seat. Should I leave this empty so there is room for the coolant if it does boil? I am also considering a fan for the bike. I know I have read about someone who used the KTM fan and it was an easy install. Does anyone have any info on what part # or where to get this. I thought I would call Boss tomorrow to see if he could get me one.

I would normally not need the fan but I just got my wife a Husky te250 and I have to do quite a bit of slowing and waiting.

Thanks for any help.
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July 16th, 2007, 09:00 AM   #3
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Hi Jeffs,

First off don't attempt to bleed your system while the bike is hot. See the link below to thread about this subject and my response. I have an 01 501 and always used the procedure described in the link as it was in the video that I got with my bike. You could give the bleed screw a try and let us know how it works out. Looks like it's not going to be easy getting to it though.

So you have a catch tank under your seat, that's great. I'm assuming it has a hose to the bottom of the tank so that after a boil over when the bike cools it will pull the expelled coolant back into the radiator. As with an automobile, there needs to always be some coolant in the tank, usually there is a cold level mark that needs to maintained.

The only problem I can see is that the overflow spigot on our radiators is not sealed very well, and while it's good enough to direct steam and hot fluid to a desirable location via the overflow hose, it may not be sealed good enough to draw coolant back from your catch tank and may pull air instead.

The over flow fitting on the cap tower is some sort of a polymer type material that is pushed in, and by the way has caused it's share of overheating problems when it drifts in a bit and catches on the bottom sealing surface of the radiator cap preventing a good seal.

Anyway, I would think that gluing this polymer spigot with some sort of high heat epoxy would be a good idea to keep it sealed.

If I am not mistaken you are going to have a very tough time mounting the KTM fan on the back side of the radiator, as the stock HBG tank is too close to the radiator. However, if you have one of the Boss's 4 gallon tanks it won't be a problem.

Hey, if you take your wife riding often enough I bet you won't be having to wait very much in the near future!

Best of luck!!


http://www.husaberg.org/index.php?name= ... 6807#56807
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June 16th, 2008, 10:47 PM   #4
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Hi

Would someone please tell in detail how to bleed the cooling system? The bike is FS650c -06. Should the engine be running when bleeding?
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June 17th, 2008, 04:34 AM   #5
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Originally Posted by wasted
Hi

Would someone please tell in detail how to bleed the cooling system? The bike is FS650c -06. Should the engine be running when bleeding?
No, the motor should be off.

Place the bike on a center stand, with a cold engine.

Remove the radiator cap, and make sure there is coolant in the tank.

Open bleed screw on head a few turns until coolant starts flowing out.

When no more air, or coolant with air bubbles in it is coming out of the bleed screw, re tighten.

Set correct level of coolant in radiator, put on radiator cap.

Go riding.
Thanks from K2Berg and highlander
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June 17th, 2008, 11:24 AM   #6
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Originally Posted by DaleEO
Originally Posted by wasted
Hi

Would someone please tell in detail how to bleed the cooling system? The bike is FS650c -06. Should the engine be running when bleeding?
No, the motor should be off.

Place the bike on a center stand, with a cold engine.

Remove the radiator cap, and make sure there is coolant in the tank.

Open bleed screw on head a few turns until coolant starts flowing out.

When no more air, or coolant with air bubbles in it is coming out of the bleed screw, re tighten.

Set correct level of coolant in radiator, put on radiator cap.

Go riding.
Thanks alot!
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March 7th, 2010, 01:55 PM   #7
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Re: Bleeding the cooling system

I've been suffering with overheating problems a lot lately. I'm hoping that my problems are the result of air in the system since a boil up event.

The bike is an 03 fe 400 and I ride tight trails a lot so engine temp is often an issue but lately it seems much worse. I've been searching posts on this topic and have seen the coolant bleed screw mentioned but I can't see it on my motor. I've also heard it mentioned that this bleed screw only appeared on 04 models and later. Can anyone confirm this for me? Or explain where the screw is located so I can find it.

If the bleed screw is not present on my motor can anmyone provide any tips for getting air out of the system some other way.

Cheers
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March 7th, 2010, 08:30 PM   #8
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Re: Bleeding the cooling system

There is a bleed screw on the older bikes, it's just harder to get to. It is a grub screw (allen head set screw) that is located right between the headers. In the video they show filling the radiator and laying the bike all the way over on the left side I believe. Then refill the radiator.
Things to try,
A higher rated radiator cap.
Make sure the radiator is not overfull (10mm over the core).
Make sure the radiator is not leaking at the overflow nipple pressed into the radiator neck.
Coolant resevoir.
Computer fan setup.
I have picts of the resevoir and computer fan setup in my gallery.
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March 8th, 2010, 06:12 AM   #9
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Re: Bleeding the cooling system

Cheers Berger, I got a burp out of her when I laid it on the left side and the coolant level went down a lttle after that so I'm hopeful that I got the air out. You're other tips all make sense and I already got the 1.8 bar rad cap. I think I'll look into the fan setup too. I found the bleed screw but it's F tight!
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March 8th, 2010, 08:29 AM   #10
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Re: Bleeding the cooling system

You can also use Redline's Water Wetter. I have used it in three bikes with very good results. Afriend of mine says Engine Ice also works well. Also check for crusty scale buildup on the rad cap sealing area of the radiator. I have had a small amount cause the cap not to seal, and cause coolant loss in a car and a bike.
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