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April 30th, 2012, 05:55 AM   #1
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Boiling gas Overheating Weep hole 70 degree motors 2010

My FE 390 has always boiled gas and overheated; like my wife I knew what I was getting when I signed on. Two rides ago, I was over heating, boiling gas, and dribbling coolant out my weep hole 10 miles from nothing while trail blazing. In a hope to just get home I filled the radiator with water from my camelback and bypassed the thermostat sensor for the fan (direct connect). The fan ran 100% of the time when the motor was running and would turn off when the motor turned off.

I stopped three times on the way home to top off the coolant. I was amazed to discover that the weep hole was dry, the gas was not boiling, and the coolant was still full. Yester day I had a choice to replace the seal in the coolant pump or go riding with the bike as is. I went riding for 8 hours with the fan running the whole time; never had an issue with coolant weeping or gas boiling. By the end of the day the coolant level had not changed.

My theory is the constant forced air is displacing the superheated air from the exhaust /motor before it can heat the gas tank. I am at a loss as to why the weep hole stopped leaking and will just look at it as a little trail magic.

Cheers,
Todd
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April 30th, 2012, 12:32 PM   #2
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

Thats good to know. I had my '09 450 boil the gas on the trail after some moderate bush wacking on a cool day.
The bike barely ran, it was not a pleasant experience on my first trail ride. I have since added more insulation to the pipe, but connecting the fan to blow all the time could be a quick fix if I do boil the gas again.

Just remove the connector from the switch in the rad and ground it somewhere. Maybe I can add a tab that can be used for this.
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May 1st, 2012, 04:18 AM   #3
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

Originally Posted by bkowal
Just remove the connector from the switch in the rad and ground it somewhere. Maybe I can add a tab that can be used for this.
bkowal,

Like your plan for a grounding tab. In the pinch, I simply removed the connectors from the thermostat and plugged them together. One rubber protector is inserted into the other with the metal clips touching.
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May 1st, 2012, 05:37 AM   #4
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

A photo would help.
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May 2nd, 2012, 07:55 AM   #5
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

Originally Posted by Ruger
A photo would help.
Mr. Ruger,

I hope this photos posts correctly. I am a techno challenged individual.

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May 2nd, 2012, 07:57 AM   #6
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

Crap, that did not work. I will ask my wife to help me this weekend.
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May 2nd, 2012, 08:04 AM   #7
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

Yes, this site is a bit challenging when it comes to posting photos. Thanks for making the attempt!
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May 2nd, 2012, 11:48 AM   #8
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

to add a photo all you need to do is use the "Img" button that is in the middle of the grey buttons above the text box to insert [img].[/img] where you want the photo to appear

then just copy and paste the address of your photo between these [img]insert%20photo%20address%20here[/img]

the only issue is the photo you load has to already be uploaded to the web be that on a social networking site, a photo hosting site or even in the gallery here.

its really rather simple.
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May 2nd, 2012, 02:25 PM   #9
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

https://picasaweb.google.com/lh/sred...qag&feat=email

Second try is a better.
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May 3rd, 2012, 05:52 AM   #10
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Re: Boiling gas Overheating Weep hole 70 degree motors 2

If you want the fan to run more often, just get the 85C thermo switch, instead of the stock 100C switch.

It may also be that your thermo switch is not right, meaning the contacts are not closing at 100C, put it in a pot of water, use a candy thermometer and bring the temp up slowly checking the switch to see when it closes. 100C = 212F.

With the fan/thermo switch functioning properly, your 390 should not be boiling over.

Another thing that could be wrong is that your rad cap is weak. If you can get it checked.

I agree that the fan running more often will help keep things cooler, and will in turn help keep the gas from boiling.

Have you had the ECU reflashed to the competition map? That helps a lot with keeping engine temps down.

As well, opening up the air box like I did also allows a lot more cool air from above the motor in, and helps keep engine temps down as well.
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2010, boiling, degree, gas, hole, motors, overheating, weep



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