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Old 09-12-2005, 08:23 PM   #1
motobrett OP
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Question KTM Overheating

So I have this outstanding 2005 KTM 450 EXC that rides like a dream. I bought it in January and have put on a few fine miles, such as the Nevada 200. Now I'm sad - the last two times I've taken her for a ride, she's gotten steamed at me.

Two weeks ago riding Webster Pass and Red Cone on a cool day and she starts spewing half way through the ride. At home after she cooled off I added about a cup of fluid to the radiator. I talked with Don at Elite Motorsports in Loveland and his response was that they've found that the 10mm over the fins instructions from KTM lead to too much fluid in the radiator for high altitudes. Fair enough.

So Saturday I'm playing on Shrine Pass and Ptarmagin Pass with the buddies and my orange beast gets pissy again. When I got home I ended up adding about 18 oz to the radiators. I cracked the bleed valve and got but a few bubbles.

Of greatest concern is that on Webster Pass I was riding with another 450 EXC that didn't overheat. This weekend I was riding with a 525 EXC and a WR450 neither of which overheated.

So the question is...is it my bike? Is it the model year? Suggestions? HELP!

Thanks
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Old 09-12-2005, 08:56 PM   #2
309
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KTM fan kit is less than $100.

My 525 came with one and has never boiled over, even when tortured.
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Old 09-12-2005, 09:49 PM   #3
Mack
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Bad rad cap?

Isn't there a larger water pump impeller kit available for these beauties as well?
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Old 09-14-2005, 09:47 PM   #4
dirtydeeds
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Can I assume you checked all the regular stuff?

Choke is not stuck
Jet is correct (and STILL screwed in)
Proper plug
Clean airfilter
etc.


I had problems with my MX/C the first couple rides. It was a jetting issue along with a broken reed valve.

You may have to take a few things apart. Start with the thermostat.

Bon chance.
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Old 09-27-2005, 09:05 PM   #5
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KTM overheating - it's the jetting!

My new 2004 625 SXC did the same thing for the first few months I had it. I kept bringing it back to the dealer and worked with KTM and finally after bringing it to another dealer the problem is fixed. The dealer I bought the bike from rejetted it to supposedly make it more rich. Once the second dealer put the factory original jetting back in the problem went away. So the jetting on these Mikuni carbs being off can definitely make your bike overheat and even boil over.

The first dealer tried to tell me I needed a fan kit as well, but I didn't give in. It's the jetting. Get it rejetted properly and it will run like a champ. -- JR
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Old 09-27-2005, 10:11 PM   #6
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I second the rad cap post. Cheap to try.

Cheers
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Old 09-28-2005, 05:22 AM   #7
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Quote:
Originally Posted by jrscott
My new 2004 625 SXC did the same thing for the first few months I had it. I kept bringing it back to the dealer and worked with KTM and finally after bringing it to another dealer the problem is fixed. The dealer I bought the bike from rejetted it to supposedly make it more rich. Once the second dealer put the factory original jetting back in the problem went away. So the jetting on these Mikuni carbs being off can definitely make your bike overheat and even boil over.

The first dealer tried to tell me I needed a fan kit as well, but I didn't give in. It's the jetting. Get it rejetted properly and it will run like a champ. -- JR
The stock SXC carb is the FCR Keihin and does come from the factory very lean causing high temps in the engine. Rejetting does wonders for the power and keeping it cooler. Factory jetting is way lean.

Techie
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Old 09-28-2005, 06:45 AM   #8
cap
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Quote:
Originally Posted by motobrett
I talked with Don at Elite Motorsports in Loveland
Did you buy it there? They claim to jet their bikes properly before selling. It seems unlikely to be a jetting issue, since the jetting hasn't changed since you bought it, and the overheating is a recent development. Furthermore, at the high altitudes around here, and the places you describe riding, a smaller jet is appropriate. But, it is worth checking to see if something shook loose in the carb.
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Old 09-28-2005, 06:51 AM   #9
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I gotta agree. Don and Roger know their stuff on jetting and at the altitudes of the passes you were on, the OEM jets, as lean as they are at sea level, are likely somewhere between just right and too fat....

I'm guessing that jetting is not your prime candidate for the warm running.
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Old 10-05-2005, 02:45 PM   #10
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Ditto some of your other answers....Bigger pilot and add the fan.
Bert
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Old 10-05-2005, 08:45 PM   #11
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I added the fan today..simple solution and insurance as well..try it it costs $100
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Old 10-06-2005, 03:48 AM   #12
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Swap rad caps with your mate who has the 450exc also.
Does your mate have more miles/hours??are you riding in low gears and leaving it ticking over when you stop??(i always hit the kill switch when i stop and restart it when i wanna go........never had an overheat problem although on my last ride the guy i was with who also has a 450exc(same as mine) kept his running whilst at the bottom of a sphincter twitching hill climb for about a minute or two and when he got to the top he still had it ticking over and eventually it spewed!!
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