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September 27th, 2016, 05:55 AM   #1
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FE570 with a reservoir tank, different rad cap?

My 570 came with a 1.8 cap. Not sure what the stock should be. It occasionally boils in hot single tracks.

I made a simple reservoir/expantion system. It fills up the expansion tank when hot but never pulls it back in the rads when it cools down.

Question is that should I be using a lower pressure cap like 1.4?

And are all KTM caps the same except the pressure rating? The reason im asking is thay someone posted something about an extra vacuum valve in the centre some cap that allows coolant go back in ,but I can't confirm if my 1.8 cap has that or not. They all look the same!
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September 24th, 2017, 03:54 PM   #2
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Have you installed the Fan Kit?
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September 25th, 2017, 01:08 AM   #3
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better install 1,8 bar cap
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September 25th, 2017, 04:33 PM   #4
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Originally Posted by keener View Post
My 570 came with a 1.8 cap. Not sure what the stock should be. It occasionally boils in hot single tracks.

I made a simple reservoir/expantion system. It fills up the expansion tank when hot but never pulls it back in the rads when it cools down.

Question is that should I be using a lower pressure cap like 1.4?

And are all KTM caps the same except the pressure rating? The reason im asking is thay someone posted something about an extra vacuum valve in the centre some cap that allows coolant go back in ,but I can't confirm if my 1.8 cap has that or not. They all look the same!
From what I understand, the stock cap is not designed to allow coolant back in from an expansion or overflow tank. It's possible to get one that is, but I can't remember where. I actually read something about it not too long ago, but can't find the info. You might try asking on the 70 thread on Advrider. I think someone there might have been talking about it.

I installed a TrailTech digital fan on my 390. It allows you to set the temp when the fan kicks on. I have mine set at 195, but haven't had it on any singletrack since the install. The fan I installed was the FN8 model.

Not sure why it's rotating my pics, but you get the idea.
Attached Thumbnails
FE570 with a reservoir tank, different rad cap?-photo-sep-16-2-46-34-pm.jpg   FE570 with a reservoir tank, different rad cap?-photo-sep-16-3-42-10-pm.jpg  
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September 26th, 2017, 05:14 AM   #5
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Interesting that you responded now because I just started experimenting some more just last week.

I added a proper reservoir tank and tried using a 1.4 bar cap from my KTM 990 that has a expansion tank of course.

I got coolant all over me while riding lol...I think my old 1.4 cap is faulty. I'll try a new one.

Looking at 1.4 and 1.8 caps I don't see any difference. We'll see what happens with a new one.
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September 26th, 2017, 02:54 PM   #6
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Originally Posted by keener View Post
Interesting that you responded now because I just started experimenting some more just last week.

I added a proper reservoir tank and tried using a 1.4 bar cap from my KTM 990 that has a expansion tank of course.

I got coolant all over me while riding lol...I think my old 1.4 cap is faulty. I'll try a new one.

Looking at 1.4 and 1.8 caps I don't see any difference. We'll see what happens with a new one.
Oh wow, I just realized this thread is a year old. Well, post up some more test results when you have time.
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September 28th, 2017, 07:03 AM   #7
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Originally Posted by jdubb75 View Post
Oh wow, I just realized this thread is a year old. Well, post up some more test results when you have time.
I installed a tested 1.4 cap on and result was not so impressive.

I filled up the rad to 10mm over the fins and rode in the city trying to heat up the bike. Cools came out and filled up about half of my expansion tank after 15minutes of riding. BUT it didn't get sucked back in to the rads when bike cooled down.

I'm thinking may be I should fill up the rads to the brim and remove all the air from the system like my 990. And full up the expansion tank to 1/3.

May be, the air gap in the rad is preventing the coolant get sucked back in.

Thoughts?
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September 28th, 2017, 10:54 AM   #8
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Parts fische shows 1.8 bar cap for 70 deg bergs and newer ktms, bergs, huskys, 2 stroke and 4 stroke. My older ktm 380 2 stroke is using the 1.4 bar cap. I've had the RLRproducts.com coolant recovery tank on my 380 for years. It works as advertised. The coolant level is always at the top when I pull off the cap to check the level. Any coolant tank should work the same way.

If you are doing any single track, tight twisty riding you should have a fan installed. I dont have a coolant tank on my FE450 but have a fan kit. The fan has saved my 450 from boiling over plenty of times. For tight twisty riding I definitely recommend you get a fan kit.
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