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May 1st, 2005, 07:32 PM   #1
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KTM Radiator Fan on 03' 400FE??

Does anyone know if the KTM Radiator fan will work on 400FE. Bad overheating problem unless I am moving. What are chances of engine damage from first over heat? Is there a thermostat I should remove? I am a brand new Bergite. Need all the help I can get.
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May 1st, 2005, 07:35 PM   #2
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What year is the FE400?
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May 1st, 2005, 07:41 PM   #3
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Forgive my dyslexia. My FE400 is a 2003.
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May 1st, 2005, 11:35 PM   #4
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hi sue (have i put 2 & 2 together and made 5?)

i trust that you have bought the bike used. and that it bubbles up and spits the coolant out? to check if you have a headgasket gone start and run the bike full of coolant but with the cap off. very tiny bubbles will keep making their way out and up through the coolant.

i had this 2 years ago. i pulled the head off and using some 'wet 'n dry' paper wrapped around a wooden block, and soap i rubbed down around the head just cleaning it up. cleaned the block up the same and then wiped down the bore wall pretty sharpish to stop any grit getting down the side of the rings.

for the second part, i fitted a new head gasket and torqued it down more than the factory figures recommend. see the 'owners doc' at the bottom of this post for slightly higher figures.

anyway, that cured it. you shouldn't be boiling up a 400 i don't think. you can try re torqueing the head down as a first cure.

regards

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May 2nd, 2005, 06:54 AM   #5
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Sue

I have seen the fan mounted, but very crudely.

What type of riding are doing?

I ride in the Rocky's in altitude with lots of elavation change and this is what I've found to control heating issues.

Try to keep your engine rpm higher so that you are moving the coolant through the rads at the highest rate possible. Lugging your engine creates more heat and cirulates teh coolant slower.

Avoid clutch usage. Fanning the clutch is a sure way to add engine heat.

taffy may have the answer for you and on the mechanical failure topic try a different rad cap, they can fail.

fry
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May 2nd, 2005, 09:24 AM   #6
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The KTM fan will not work, there is not enough room. I have just mounted two 92mm computer fans on my 04 FE650e. As of yet the setup remains untested. Perhaps I will have the results next weekend. My biggest concerns are actual effectiveness and durability (due to water intrusion). The fans will move 250 cubic feet of air per minute, this should be great at low speeds. The big question is that will it be enough at higher speeds. If it works it will be an inexpensive modification. $150 with the BOSS radiator guards being the most expensive parts.
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May 2nd, 2005, 09:39 AM   #7
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I am a college automotive instructor and we teach (sounds weird) that removing a thermostat will lead to overheating quicker because the coolant can move too fast, thus not transferring any heat! I have seen it for myself on a few race applications and a restrictor cured the problem in both cases. As far as the "physics" behind this, maybe someone else can shed some more light. Volvonut
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May 2nd, 2005, 11:00 AM   #8
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Volvonut,

You are right on the money. What happens is that the coolant flows too quickly through the heat exchanger (radiator), and, as you said, does not have time to dump the heat. So, what ends up happening is that the coolant becomes heat saturated, and then boils.

The new husaberg's have a thermostat, where as the 04's on back do not. My 2004 550 overheats very seldom, usually when I'm having to abuse the clutch in tight races. What I have found as the cure most of the time is (as another post pointed out) is to keep the rev's up enough to circulate the coolant a little faster. Just the opposite of what's happening in the above paragraph.
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May 2nd, 2005, 11:18 AM   #9
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Excellent info Daleo and Volvonut. I was considering removing the thermostat for complexity reasons and have ruled that out now. And now I want to go thrash them in the tite stuff!!!!
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May 2nd, 2005, 11:45 AM   #10
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I have been running the two 92mm computer fans on my 04 550FE for almost a year now. No problems with durability on the fans, I replaced one due to a cracked fan blade from a stick lodged in the guard. They are also behind a aluminum radiator guard. They help, do not completely cure the heat build up in the slow going. I run Evans waterless coolant and a temperature gauge, when the temperature gets above 240 on 90+ degree days I pull over and let it set a while. I don't have any overheating problems if I can keep it above 15 mph.
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