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Cooling Systems Cooling Systems - Radiators, Water Pumps, Fans, Coolant, etc.


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May 2nd, 2005, 11:47 AM   #11
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I doubt that removing the thermostat would be detrimental in this application. Just my 2 cents. It would easy enough to experiment with just the same.
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May 2nd, 2005, 05:27 PM   #12
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I am not worthy...I am not worthy.... You guys seem to understand the problem fairly well. I just need the fix. I do not think my bike has a thermostat. Thermostat does not show in the manual as I recall..

I like the idea I saw posted with regards to using an overflow bottle. KTM makes one in the hard parts catalog, but one post I read talked about pirating a Yamaha overflow/recovery bottle under the seat. The fix looks good/hides well and will at least save the fluid from total loss on an overheat.

I was on very rough trail and slow speeds, fanning the clutch and not enough air over the radiator. I thought a fan would fix the problem, but the KTM apparently won't fit. We shall see. There is an Italian outfit called SPAL that makes a 6.5 and 7.5 inch cooling fans for motorcycle radiators. I assume they are water proof. If I hit upon anything, I will announce.

Thanks you for all the input. By the way, the bike is a left over BRAND NEW 2003 FE400 off the floor from G&G in Albany Oregon.
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May 2nd, 2005, 08:25 PM   #13
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As Daleo pointed out the 03's do not have a thermostat. It was introduced in 05. I have not experienced any overheating on my 05 FE450 so far (20 hours) . It would be easy to fit an 05 thermostat to an 03 as they just splice into a hose. If you ride a lot of tight technical stuff perhaps a Rekluse autoclutch might help keep things a bit cooler as you wouldn't have the extra clutch abuse heat to contend with. Also slightly richer jetting could help.
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May 2nd, 2005, 08:53 PM   #14
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Sacberg,
I am running the Evans coolant as well. Where did you find your temp guage?
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May 2nd, 2005, 09:20 PM   #15
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There are several places on the web, this is where I got mine:

Speedwerks
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May 3rd, 2005, 12:54 AM   #16
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Just wondering, would Water Wetter work to keep the temps down? I know that road race bikes use it because of the glycol coolant spill hazards and it is said to keep engines cooler (I never ran it). Only problem is the lack of freeze protection. I know Evans coolant was mentioned and I am not familiar with it but if it about the same stuff then sorry.
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May 3rd, 2005, 06:46 AM   #17
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Water wetter gave me no apparent advantage, the same can be said about Engine Ice. The only advantage of Evans is that you WILL NOT boil over and run basically a zero pressure system (which is nice). The boil point of Evans is 370F at zero psi. I would imagine you would sieze before you boiled over using the factory pressure cap. That is why it is a good idea to monitor the actual coolant temp..
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May 3rd, 2005, 07:34 AM   #18
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I concur, I got NO improvements using Water wetter or Engine Ice before switching to Evans. One benefit of Evans it eliminates the need for an overflow catch can, you engine will go before it will boil.
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May 3rd, 2005, 08:50 AM   #19
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I would like to know the wiring diagram for the computer fans. Where do you connect it on the bike's electrical circuit and do you add any type of resistors? Computer voltage is 12 volts (ok so far) and the amps delivered to a computer fan is below 0.2A (err....)

Also it seems that Evans is 100% Propylene Glycol. Why not get some automotive coolant like stock Dexcool (although I have read it plugs up the hoses).

Just found this on KT:

http://ktmtalk.com/index.php?showtopic=97608
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May 3rd, 2005, 08:55 AM   #20
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The fans are fused through the battery and switched using a common automotive fan switch. Dexcool sucks and has a boil point of about 230F.
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