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Old 11-07-2004, 06:53 PM   #1
rapiti OP
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Overheating KTM 640 Adventure

Went on a woods ride yesterday, and had some cooling issues. This has been brewing for a while, and I have some questions.

1) Do the "supercool" (I forget the names) liquids do more harm than good? Better than ionized water? Recommendations (that you have used!)

2) The idiot light comes on 62 seconds before the fan kicks in. What's up with that? The fan used to come on first by a good while. What deterioration is this a sign of?

3) After riding with the idjut light on for a while, the trail crossed the road, and I went for a cruise on the road to get some air flow. It took a lot longer than I had expected for the temp. light to go out. Later, I even had it come on while doing 55-60 on the road! Does this point to the water pump? Where else?

I plan on flushing the radiators, checking the thermostat, and maybe replacing the water pump impeller. This is all new to me. Any hints/suggestions? I apologize if this has been covered before. Search (and my memory) isn't what it once was...

Gracias,

Paolo
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Old 11-07-2004, 07:11 PM   #2
markjenn
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At highway speeds, you should have plenty of cooling capacity so if you're getting the light on while at speed, you've either got a bad sensor or a serious issue like insufficient coolant, trapped ar in the system, or a bad water pump.

The cooling fan and the high temp indicator are on separate circuits.

I'd first flush the system and make sure you have good coolant. Then I'd look to the thermostat. Finally, the water pump. If you're losing coolant, the cap might be bad.

If the bike has no other overheating symptoms, it's possible that everything might be explained by the idiot light sensor coming on too early. Normally, the cooling fan comes on much earlier than the high temp light, so I wonder if it's possible that everything is fine - just the light is coming on prematurely.

I wouldn't mess around with water wetter right now. This is a band aid and would just mask the symptoms slightly.

- Mark
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Old 11-08-2004, 11:55 PM   #3
inte
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went/going through the same thing...

I have an '03 640 Adventure with similar symptoms. When I first got it, the thing rarely got above 3 bars. A few months later (& to the present) it hits 6-7 bars & I've had the temp light come on a couple times.

I tried water wetter & Engine Ice and, if anything, it made it worse! Deionized water & Motorex coolant seems to be the deal - water wetter doesn't seem to affect anything too much - can't recommend Engine Ice - at least for this application.

Here's the interesting thing - I'm in the somewhat-unique position of having had 2 separate IMOs in my 640 within the 1st year. The first computer rarely went above 3 bars and never went above 4 the whole time it was in. The second computer runs at 3-4 bars on highway & will jump to 5 at stop lights on a regular basis. I pulled the thermostate & water pump - both good. No air in system (checked bleed hole near spark plug), flushed system 3 or 4 times & tried different coolants...

These computers seem to be calibrated differently!

I'm also thinking the 640s (& the 950s from the reports I hear) are fairly succeptable to weather/temperature changes. My bike rarely went over 3 bars in winter, in summer I find it at 4-7 bars a lot - though in Southern CA there's not a huge difference in summer/winter weather...
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Old 11-09-2004, 10:03 AM   #4
cbob
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Be carefull with deionized water as it will suck the ions out of any metals it comes in contact with. Deionized water is pure H2O molecules, which sounds good, but has no mineral content to neutralize the water. You need SOME mineral content or the DI water will leach the minerals right out of the cases. End result is holes in very expensive parts!

Distilled water is a much safer liquid for cooling (with aprooved anti-freeze, of course).

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Old 11-09-2004, 03:50 PM   #5
inte
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Quote:
Originally Posted by cbob
Be carefull with deionized water as it will suck the ions out of any metals it comes in contact with. Deionized water is pure H2O molecules, which sounds good, but has no mineral content to neutralize the water. You need SOME mineral content or the DI water will leach the minerals right out of the cases. End result is holes in very expensive parts!

Distilled water is a much safer liquid for cooling (with aprooved anti-freeze, of course).

- c
I zoned ... sorry. Meant distilled ... that's what the big jug I have in the garage says. Didn't know that about deionized though ... interesting.
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Old 11-10-2004, 05:57 AM   #6
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Heating

Would be interesting to stick a couple of those racing self-adhesive temp strips on the rad & case to see just what temp the bike runs at vs. what the IMO says.

Have been thinking of doing that on our 950 & 640 Advs.
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Old 04-11-2005, 11:53 AM   #7
Gummee!
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Quote:
Originally Posted by inte
I zoned ... sorry. Meant distilled ... that's what the big jug I have in the garage says. Didn't know that about deionized though ... interesting.
DI is what I'm *supposed* to be topping my reef off with... No nasty suspended particles for the algae to feed off of.

'Course, I haven't found an inexpensive enough method of acquiring said DI, so I top off with filtered tap water. The green hair algae shows it too!

Oh well.

Back to the moto content:

M
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Old 04-12-2005, 01:32 PM   #8
Happe
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Quote:
Originally Posted by rapiti
Went on a woods ride yesterday, and had some cooling issues. This has been brewing for a while, and I have some questions.

1) Do the "supercool" (I forget the names) liquids do more harm than good? Better than ionized water? Recommendations (that you have used!)

2) The idiot light comes on 62 seconds before the fan kicks in. What's up with that? The fan used to come on first by a good while. What deterioration is this a sign of?

3) After riding with the idjut light on for a while, the trail crossed the road, and I went for a cruise on the road to get some air flow. It took a lot longer than I had expected for the temp. light to go out. Later, I even had it come on while doing 55-60 on the road! Does this point to the water pump? Where else?

I plan on flushing the radiators, checking the thermostat, and maybe replacing the water pump impeller. This is all new to me. Any hints/suggestions? I apologize if this has been covered before. Search (and my memory) isn't what it once was...

Gracias,

Paolo

Hi Rapiti,

just a quick one,
the temperature gauge is where on your bike (should be near the cyl head in the small cool circuit before the thermostat.)
The tempswitch for the Fan is where? (should be near the bottom of the right radiator and in the big cooling circuit behind the thermostat)
Three guesses what makes trouble in your cooling system

cheers

Stefan

If you need more cooling rip out the thermostat like on the Rally bikes ;-)

Happe screwed with this post 04-12-2005 at 02:07 PM
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