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March 20th, 2012, 02:36 PM   #1
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"Max" or "Dangerous" temperature

At what temperature is the bike at risk for damage?
Any chance the CV4 fuel blanket actually reflects the heat towards the motor enough to make it overheat faster?

-2010 FE450
-temperature from Trail Tech Voyager GPS computer with temperature gauge installed in radiator hose

Why do I ask? Because I installed a new FMF pipe and CV4 fuel blanket to stop the fuel boiling. That seemed to work for the fuel BUT... It got up to 225F after just a few minutes of tooling around my property mostly in 1st gear technical stuff, and on a 60F degree day. So it seemed to heat up much faster than I remember last year.

Anyway, I want to watch the temp going forward and make sure I don't kill the thing (although I remember getting to 260F on the CRF250X a couple of years ago).

Thoughts, opinions, and facts always appreciated...
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March 20th, 2012, 03:14 PM   #2
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Re: "Max" or "Dangerous" temperature

I use a Trail Tech TTO Temperature Guage wich records the maximum temperature.
The highest I have seen is 104C which is pretty close to your 107C (225F)
Not sure where you are measuring the coolant temperature, I am measuring it as per this post:
Temperature Gauges

Are you using the factory fan kit?

Originally Posted by fljar
At what temperature is the bike at risk for damage?
I am not sure.


Originally Posted by fljar
Any chance the CV4 fuel blanket actually reflects the heat towards the motor enough to make it overheat faster?
I wouldn't think so but that is just my opinion.

Just on another subject,
We use mainly the metric system in Australia but still talk about people being 6foot tall or 6foot 2, or a baby was born 7lbs heavy, or buy wood as 4 x 2 (think US call it 2 x 4 ) etc... I just think of all the imperial measurments Fahrenheit is just weird. Celsius is just so easy, 0 is water freezing and 100 is water boiling
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March 20th, 2012, 05:37 PM   #3
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Re: "Max" or "Dangerous" temperature

225 is pretty harmless. At some point when you quit riding in circles on your property you will get some airflow through your radiators and the water temp will cool down.


Really as long as your coolant is not boiling, you are fine. If you run waterless coolant and no fan, like I do, you need to be a bit more careful, but I routinely will run up to 240 degrees for short periods of time and don't worry about it. I also run good synthetic oil and change it often too. Oil temperatures are what matter in the long run anyway.
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March 20th, 2012, 09:10 PM   #4
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Re: "Max" or "Dangerous" temperature

Thanks Davo and Johnf3.

Davo - I have the temp sensor in the same location as you (in fact, it was that post that gave me the idea, so thanks again). Also have the fan - which didn't kick on due to the connectors not being tight (gotta fix that). By the way, what temp is the fan supposed to kick on? Regarding the Fahrenheit vs celsius bit ---- I live in the US but work in Canada so that still throws me off when asking about the weather. Guess I need to learn a quick conversion trick.

Johnf3 - just running regular Motorex or Honda coolant and the fan. Also using Motorex synthetic oil, which should help with the protection as I have been at or above 240f many times as well in the technical stuff.

Just seemed to get hot a lot faster than last time I rode... I guess we'll see in Moab in a couple of weeks.

Thanks again gents.
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March 21st, 2012, 06:56 AM   #5
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Re: "Max" or "Dangerous" temperature

The thermo sensors for the newer KTM/Berg fan kits are 100/95 units; meaning that the fan turns on at 100C (212F) and off at 95C (203F).
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March 21st, 2012, 07:03 AM   #6
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Re: "Max" or "Dangerous" temperature

Originally Posted by Chas
The thermo sensors for the newer KTM/Berg fan kits are 100/95 units; meaning that the fan turns on at 100C (212F) and off at 95C (203F).
Thanks Chas. Just ordered a new fan switch (95/90) --- hopefully won't cause battery issues.
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March 21st, 2012, 01:42 PM   #7
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Re: "Max" or "Dangerous" temperature

Did I put my sensor on the wrong hose, I put it on the return from the head back to the radiator.



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March 22nd, 2012, 03:41 AM   #8
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Re: "Max" or "Dangerous" temperature

Originally Posted by UPSguy
Did I put my sensor on the wrong hose, I put it on the return from the head back to the radiator.
No, I think the return out of the head is probably a more accurate spot for engine temperature than the side I used
I just looked for the easiest coolant hose to mount the sensor, I should have thought a bit harder
What maximum temperature are you seeing UPSguy?
How do you keep your bike so clean?
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March 22nd, 2012, 04:17 AM   #9
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Re: "Max" or "Dangerous" temperature

I just got the Voyager mounted up last weekend, saw 190 stopped for a traffic light.

Simple Green and SC1, no pressure washer.
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May 1st, 2013, 09:14 AM   #10
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Re: "Max" or "Dangerous" temperature

I have the Voyager and the sensor mounted as shown returning from the head. When stopped and idling I can see 260F but have never boiled over. That was with Fluidyne upgrade rads and no fan. Last night I went back to stock radiators and fan though because the Fluidyne does not fit on the 570. Thicker so it touches the valve cover on the left side. rats..
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