"Max" or "Dangerous" temperature

fljar · Mar 20, 2012

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...

Davo · Mar 20, 2012

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?

fljar said:
At what temperature is the bike at risk for damage?

I am not sure.

fljar said:
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 :wink: ) 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 :confused2:

Johnf3 · Mar 20, 2012

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.

fljar · Mar 20, 2012

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.

Chas · Mar 21, 2012

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).

fljar · Mar 21, 2012

Chas said:
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.

UPSguy · Mar 21, 2012

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

Davo · Mar 22, 2012

UPSguy said:
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? :lol:

UPSguy · Mar 22, 2012

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

Simple Green and SC1, no pressure washer.

Chief Lee Visceral · May 1, 2013

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..

GregUK · May 1, 2013

The radiator cap is nominal 1.8 bar. At that pressure the boiling point of water is 242F (117C).

With a 50% antifreeze mix, the boiling point at 1.8 bar is about 250F (121C).

Given the pressure cap is OE at 1.8 bar, one has to presume that the engine is designed to run up to that temperature (which should be measured as near the cylinder head - the hottest part of the cooling system - as possible).

At high operating temperatures, the oil quality becomes pretty important as the oil is likely to be much hotter thsn the coolant. Synthetic oil is much more tolerant to high operating temperatures than semi or straight mineral oil.

Duken4evr · Jan 4, 2014

You can swap out the 95/100 KTM fan switch for a 85/90 BMW car fan switch. The fan will run more, but the 211 Watt charging system on these bikes can easily handle it.

I have a trail tech gauge with the sensor as shown in the photos at the head outlet. Prior to swapping the switch, my fan kicked on around 218 F. Now it comes on around 204 F. No matter what kind of snot I ride, it is hard to get the bike to heat past 215 F. The earlier fan on temp gives you quite a bit more leeway.

icedvolvo · May 27, 2014

fljar said:
....
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....

Thread is a bit old but still interesting.

I noticed a similar increase in temp when I fitted a pipe to my 2013 350 as well. If it was a carby I would say it is running lean and put a bigger jet in .... not sure what to do with injected ?????

I have mostly solved the problem with better coolant and a new lower thermo (see article in forum).

"Max" or "Dangerous" temperature

Help Support Husaberg:

fljar

Davo

Johnf3

fljar

Chas

fljar

UPSguy

Davo

UPSguy

Chief Lee Visceral

GregUK

Duken4evr

icedvolvo

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