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May 6th, 2010, 07:03 PM   #1
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'10 FX 450 Radiators

Guys,
are the radiators on the new FX the same as what KTM has been using for the 09/10 bikes?
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May 6th, 2010, 07:56 PM   #2
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Re: '10 FX 450 Radiators

The FX uses the same rad as an SX KTM. No provision for a fan.
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May 7th, 2010, 05:05 AM   #3
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Re: '10 FX 450 Radiators

Correct, not fan friendly and no thermostat provision on the bottom.
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June 21st, 2010, 03:59 PM   #4
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Re: '10 FX 450 Radiators

thanks for the reply, gents.... a friend of mine with 09 FE 390 has experienced some over heating issues like my FX 450, and has started using EVANS fluid in his coolant system.. he rode this past weekend in a scramble, in mid 95 degree weather, and did not boil in the slow tight stuff... I have been a little skeptical of the Evans, due to its ultra high boiling temperature (250 degrees or so), as I was thinking if I got bike hot enough to cook this stuff out, it would do a LOT of damage to the machine... but everyone that runs Evans likes it, and has no issues... anyone else out there familiar with this stuff?
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June 21st, 2010, 04:15 PM   #5
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Re: '10 FX 450 Radiators

Go to the cooling system forum and do a search for Evans.

Been running it in my 04 550 for a long time, the EPGr. The only draw back with it is that it is not recommended for temps below freezing. Although I have used it in the teens before. And you can't be an idiot and use this stuff. In a pressurized system it won't boil until 400 degrees, so you have to use your head a little.

I used it in my 04 550 b/c I couldn't put a fan on my bike, and even though it runs about 20 degrees warmer than regular glycol/water coolant, it stayed in the bike.

It also has the advantage of running at or near zero pressure.

However, with a little bit of home work, and a trip to the radiator shop you can get a fan on your FX which is the best way to go. Just get the fan kit for the FE's, and have a bung welded into your radiator so you can use the stock temp switch.
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June 21st, 2010, 06:56 PM   #6
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Re: '10 FX 450 Radiators

There is also a kit for certain KTM 300's that has a fitting that goes into a radiator hose for the thermostat. That way, no work necessary on the radiator.
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June 22nd, 2010, 12:25 AM   #7
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Re: '10 FX 450 Radiators

hi guys.there is a fan kit available from your dealer specified for the fx.the stat goes in the hose so no need to cut & weld rad.regards htm
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June 22nd, 2010, 05:38 AM   #8
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Re: '10 FX 450 Radiators

Right you are! Thanks HTM.

Look at the bottom of this page: http://www.husaberg.com/PowerParts.250. ... id=+2301J0
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June 22nd, 2010, 06:35 AM   #9
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Re: '10 FX 450 Radiators

Originally Posted by ls1yj
a friend of mine with 09 FE 390 has experienced some over heating issues like my FX 450, there ?
all models have a reflash, 09s and 2010s, that will really reduce the amount of overheating. It really inproved the lowend on my 570, and made pull smoother in the transition
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March 22nd, 2011, 06:39 PM   #10
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Re: '10 FX 450 Radiators

Just throwing this out there, but it seems to me that a very high boiling point would really hinder cooling of hot spots in the engine.

When an area gets locally hot like on the head near the exhaust valves, coolant boils on that spot and the bubbles are scrubbed away by the quickly moving coolant, where they recondense again. The process of local boiling and scrubbing removes a lot of heat from hot spots. Just some Kevin Cameron type stuff I recall reading.
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