Thermo bob mod for 2007 KLR - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 24 Old 03-09-2018, 03:28 AM Thread Starter
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Thermo bob mod for 2007 KLR

Another question from a newbie: Is the thermo bob mod only necessary in colder climates or is it an all around good mod? As far as I understand it it brings the engine up to temperature quicker. Here in South Africa it is quite warm so I am wondering if this mod would cause more harm then good.
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post #2 of 24 Old 03-09-2018, 09:17 AM
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Properly installed (not crossing up the hoses emanating from the water pump) the T-Bob has never done any harm. I live in a climate similar to ZA and often ride in temperatures in the 40℃ range.

The coolant temperature comes up to midscale (mine is a 2009) quickly on the temp indicator. The cooling system controls the upper temperature quite well, so the overall effect is that the engine operates, 95% of the time, at mid-scale. It will pop up higher when in stop and go traffic, but that is completely normal and not related to the T-Bob.

I also ride in temperatures in the 0℃ range from time to time in vain attempts to kill myself*. Again, the engine comes up quickly to mid-scale and stays there.

*To date, I have never been killed. Not even once.
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Last edited by Tom Schmitz; 03-09-2018 at 09:21 AM.
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post #3 of 24 Old 03-09-2018, 01:30 PM
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While I think the T bob is even more beneficial in cold climates and cold weather use, it is still a good thing even in relatively warm temps since warm ambient is still cold engine temps. .....no downside other than the cost that I can tell and maximum engine temperatures should be unaffected. Bill has info on Gen1 cooling system mods to increase overall cooling capacity; http://watt-man.com/uploads/Margin.pdf


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post #4 of 24 Old 03-09-2018, 06:19 PM
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I was wondering this same thing for my 07 as I live in South ga. I do notice riding now it barely hits the line in the lower narmal range. That will probably be my next upgrade. I was also thinking of putting the watt man overlay in too
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post #5 of 24 Old 03-09-2018, 11:39 PM
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Quote:
Another question from a newbie: Is the thermo bob mod only necessary in colder climates or is it an all around good mod? As far as I understand it it brings the engine up to temperature quicker. Here in South Africa it is quite warm so I am wondering if this mod would cause more harm then good.
Quote:
I was wondering this same thing for my 07 as I live in South ga. I do notice riding now it barely hits the line in the lower narmal range. That will probably be my next upgrade. I was also thinking of putting the watt man overlay in too.
Just a fun fact:

After the thermostat opens, the KLR650 is at the mercy of air flow and coolant circulation, both unchanged, Thermo-Bob or not. In other words, the Thermo-Bob does not enhance cooling IMHO (although some insist otherwise).

The Thermo-Bob stabilizes engine coolant temperature more thoroughly, and at a higher temperature than the stock cooling system. Competently designed and manufactured, responsibly marketed, thoroughly tested, service life effects remain unquantified.

My ex-South African riding partner (80,000 miles on his '08 model) LOVES his Thermo-Bob; my '07 muddles through without one.

As Tom Schmitz posts above, a Thermo-Bob certainly does no harm (if installed correctly); your call entirely whether to install one or not.
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post #6 of 24 Old 03-10-2018, 09:46 AM
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The Thermo-Bob is my 1st recommended modification in my oil flow modifications.

http://www.klrforum.com/1987-2007-wr...mportance.html

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #7 of 24 Old 03-10-2018, 12:03 PM
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Originally Posted by pdwestman View Post
The Thermo-Bob is my 1st recommended modification in my oil flow modifications.

http://www.klrforum.com/1987-2007-wr...mportance.html
Back in the oil-guzzler days (2008-2009 models), some even suggested the absence of a Thermo-Bob was the CAUSE of excessive oil consumption!

Not to ignore those who insisted the lack of the PCV Valve Mod (a check-valve in the sump breather hose) was the cause!
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post #8 of 24 Old 03-10-2018, 01:46 PM
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the cause is a bad/ovaled/tapered/deformed bore coupled with a poor ring redesign..... resulting in a lack of sealing at the bottom end of the stroke. the bore issues probably are exacerbated by thermal shock which the Thermobob helps mitigate.

2 cents,

Dave
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post #9 of 24 Old 03-10-2018, 04:56 PM
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I am undecided on doing the thermobob first or upgrading the front brake rotor. Decisions decisions....
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post #10 of 24 Old 03-10-2018, 05:03 PM
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Originally Posted by rebus20 View Post
I am undecided on doing the thermobob first or upgrading the front brake rotor. Decisions decisions....
May I recommend, Safety First?
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pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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