Running temp - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 27 Old 07-05-2019, 10:46 AM Thread Starter
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Running temp

I apologize in advance because I'm sure this is answered somewhere but I couldn't find it...my 2011 KLR 650 with 9,800 miles on it seems to get really warm or even hot when I'm sitting at a light or stopped for a few minutes.
After I bought it, April 2019, I had the radiator flushed and put in Engine Ice.
Coolant level is good and when I'm moving the temp is good.
Is this normal and I'm worried about nothing?
Thanks for you advice,
Frank

Frank
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post #2 of 27 Old 07-05-2019, 12:16 PM
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It is Not Too hot unless the needle on the gauge is touching the Red Zone.

1/2 to 5/8th scale would be normal in traffic or off-road trail riding, this the temp range that the fan should come on. 3/4 scale could be Normal on a Hot Summer day, even on a Gen 2.

We really need more complete info from you.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #3 of 27 Old 07-05-2019, 05:45 PM
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Normal.

Electric cooling fan should kick in when the coolant reaches around 200 degrees F.; functional fan (and thermal switch) will cool engine down via coolant to safe temperatures.

Assuming reasonable calibration of your temperature gauge, anything under far-right red indicates safe temperature, as pdwestman posts above.

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
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post #4 of 27 Old 07-10-2019, 05:41 AM
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This is totally normal and you have nothing to worry about.

Please do not lecture me on the effects of temperature and density altitude on an internal combustion engine -Thank you.

2003 KLR650.... With all the bells and whistles
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post #5 of 27 Old 07-10-2019, 02:28 PM Thread Starter
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Gentlemen,
Thank you very much for the insight.
I always look to the experts for advice, even when I'm not a rookie (in this case I am).
Do you feel like Engine Ice is the best coolant?
Also, my KLR has not had the ThermoBob installed. It sounds like that is critical, do you agree?
Thanks again,
Frank

Frank
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post #6 of 27 Old 07-10-2019, 02:48 PM
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The Thermo-Bob actually causes a HIGHER nominal operating temperature than a stock cooling system (has a higher thermostat threshold).

Otherwise, advantages are assumed/presumed from stabilizing coolant temperature more fully, and for operating at a higher design goal temperature.

Critical? Your call! You might consider, among the thousands of KLR650s manufactured and marketed worldwide over 25 years plus of production, what percentage have a Thermo-Bob installed.

Also, the environmental climate of operation plays a role--Thermo-Bob value probably greater in colder weather (faster warm-up).

The Thermo-Bob is soundly designed, conscientiously manufactured, and responsibly marketed, AFAIK. Still, your choice!

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
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post #7 of 27 Old 07-10-2019, 03:36 PM Thread Starter
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Very helpful, thanks.
It sounds like living in the South I may not need to worry about the ThermoBob.
I just need to verify that my fan is coming on as needed.
Thanks very much Damocles, and get out from under that sword.
Frank

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post #8 of 27 Old 07-10-2019, 04:09 PM
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I would slightly disagree with Damocles on a couple of points;

- the Thermobob only causes a higher MINIMUM operating temperature; it has no real effect on the maximum temperatures the engine will see. From Bill himself: " Bottom Line – This hasn’t raised peak temps at all – but have raised minimum temps when you're
riding and it's below 80F outside. Even here in the desert, that's the majority of my year. In a lot of places,
that's the entire year. "

- as per the above, the Thermobob has a benefit regardless of climate. While higher minimum oil temps are a good thing, I'd suggest that greatly reducing the delta T between incoming and outgoing coolant ("cold shocking" the cylinder) is the greatest benefit.

lastly, while there are thousands of KLR's running and living their lives with the stock cooling system (i.e no coolant bypass, aka Thermobob), and the argument can certainly be made that one isn't strictly NECESSARY, there is little doubt that it can only help and will undoubtably increase longevity.....how much? impossible to quantify and it would vary on an individual case basis anyhow.

Dave
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post #9 of 27 Old 07-10-2019, 06:00 PM
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No disagreement, DPelletier--any conflict appears to me to be regarding definition of terms: Specifically, what does, "critical" mean, in the context of the Thermo-Bob installation?

Further, I said the Therm-Bob raised the NOMINAL coolant operating temperature. Since the stock thermostat opens at a temperature lower than the Thermo-Bob's, I think the modified cooling system would operate at a higher nominal temperature. I'd question the term, "minimum," because . . . unless the thermostat is open, seems like to me the coolant temperature remains below that of the thermostat thresholds. If "operating temperature" occurs only when the thermostat opens, then . . . minimum operating temperature might be more appropriate terminology. I think KLR650 engines operate for considerable time during their service lives with thermostats closed, but I have no supporting evidence of the concept and could be in abject error.

You make the correct (but to some, controversial) comment regarding the Thermo-Bob's lack of influence on maximum coolant temperatures: After the thermostats open, stock or Thermo-Bob, either engine configuration's coolant temperature is at the total mercy of water pump circulation and air flow.

"Cold shock" remains an interesting concept; I've wondered at the failure mechanism and the components affected from the phenomenon; same for "heat cycling," reduced by the Thermo-Bob's greater temperature stability than that of the stock system.

Then . . . some believe the absence of a Thermo-Bob causes cylinder bore distortion ("ovalization"), with consequent ring failure and excessive oil consumption.

I think the Thermo-Bob appears consistent with physicians' Hippocratic Oath, "First, do no harm." Critical? Each rider alone determines whether the modification is "critical," to himself.

DISCLAIMER: My riding partner, 95,000 miles on his '08, LOVES his Thermo-Bob!

---------------------------------------------------

Peripheral thought: Does the disappearance of the KLR from the market affect Thermo-Bob sales numbers? Will the Kawasaki successor (if any) to the KLR650 have a modern coolant bypass cooling system (as now offered by the aftermarket Thermo-Bob)?

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
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post #10 of 27 Old 07-10-2019, 06:15 PM
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Quote:
Originally Posted by Damocles View Post
Further, I said the Therm-Bob raised the NOMINAL coolant operating temperature.
I agree.

Jason
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