Author Topic: 2020 300 SEF Factory coolant boiling/recovery tank  (Read 1486 times)

Trailrider383

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2020 300 SEF Factory coolant boiling/recovery tank
« on: August 26, 2019, 08:56:57 AM »
New owner here.  Coolant should expand into the recovery tank as it heats up. I can hear mine boiling in the radiators and the coolant level never changes in the tank. I  checked for a kinked hose and it looked fine. I can get a little flow through it with air but not much. My guess is the recovery tank barb is restricted from the molding process or the crimped clamp on the hose was crimped too tight.  Anyone have this problem before? I guess i will cut off the clamp and check when i get home from camping.

BryanZg

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #1 on: August 26, 2019, 10:48:16 AM »
I had that problem on my '18.  Just take a drill bit open the hole up.  Make sure you clean it out good.  Because when it sucks the coolant back into the radiators it will pull any dirt or debris back in and plug the hole up again.

Dangermouse

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #2 on: August 27, 2019, 12:04:47 AM »
New owner here.  Coolant should expand into the recovery tank as it heats up. I can hear mine boiling in the radiators and the coolant level never changes in the tank. I  checked for a kinked hose and it looked fine. I can get a little flow through it with air but not much. My guess is the recovery tank barb is restricted from the molding process or the crimped clamp on the hose was crimped too tight.  Anyone have this problem before? I guess i will cut off the clamp and check when i get home from camping.
If you have a Factory model, it shouldn't boil as there should be a factory fitted cooling fan....
2019 300 SEF Factory
2011 TE449
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Trailrider383

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #3 on: August 27, 2019, 08:16:36 AM »
Any slow going and it is boiling away every time I stop. Fan is running a lot.

eagle

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #4 on: August 27, 2019, 12:58:53 PM »
Have you checked that it doesn't have a air bubble in radiator ?
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Trailrider383

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #5 on: August 27, 2019, 06:09:07 PM »
It's full of coolant when I take the cap off. Don't  know how else to check for an air bubble.

eagle

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #6 on: August 28, 2019, 12:42:43 AM »
There's a bleed screw on the radiator on my 2015 300i
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jamracing

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #7 on: August 31, 2019, 05:19:12 AM »
If you're constantly running it that hot, you might want to replace the coolant with Evans or Engine Ice.


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2020 300 SE Factory

erdat

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #8 on: September 02, 2019, 10:46:18 PM »
here is a  link that might be of interest on a similar issue: http://shercoforum.com/index.php?topic=2194.msg21368#msg21368 with an additional solution suggested by eagle.

I personally have followed eagle's suggestion and installed a bigger impeller. In order to do that, besides buying the impeller which comes with a "riser to make additional room for the impeller", you have to buy a second cover seal from your Sherco dealer.   

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Clay

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #9 on: September 03, 2019, 07:47:09 AM »
Are you sure its the coolant you hear boiling? Could be the fuel bubbling. The next time it does it take the fuel cap off. If it stops its the fuel and not the coolant. You could have a bad inline one way valve and its not letting the fuel vapor out quickly enough.
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Dangermouse

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #10 on: September 04, 2019, 05:12:10 PM »
Are you sure its the coolant you hear boiling? Could be the fuel bubbling. The next time it does it take the fuel cap off. If it stops its the fuel and not the coolant. You could have a bad inline one way valve and its not letting the fuel vapor out quickly enough.
This is great advice. It is something other riders have heard too.
Fuel noises rather than coolant.
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Trailrider383

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #11 on: September 04, 2019, 07:19:31 PM »
Why would the fuel bubble? Because it's hot? I don't know. This is my first fuel injected dirt bike.
"Bad inline one way valve?" Is that what looks like a check valve in the hose off the fuel cap?

devans

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Re: 2020 300 SEF Factory coolant boiling/recovery tank
« Reply #12 on: September 04, 2019, 11:22:37 PM »
Why would the fuel bubble? Because it's hot? I don't know. This is my first fuel injected dirt bike.
"Bad inline one way valve?" Is that what looks like a check valve in the hose off the fuel cap?
Yes, if the valve is blocked it won’t breathe and can cause the fuel temp to increase, and in extreme conditions can cause the fuel tank to expand.
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