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Old 07-01-2008, 08:04 AM   #1
bmg3738
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Default Who’s done the Thermo-Bob mod?

How many ’08 owners have installed the “Thermo-Bob” mod and what are your thoughts and comments about this product? I assume longer engine life will be the most beneficial result. What were some of the problems or issues you encountered during installation (if any)?
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Old 07-01-2008, 12:05 PM   #2
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Default Re: Who’s done the Thermo-Bob mod?

I did my 08...I'm a sucker for these types of things. Next for me (in about 5 min in fact) is the PCV mod.

I have a short ride to work and it's great how fast the engine comes to proper operating temp. The other thing I've noticed is the consistency in the temp.

I took my time during installation and it went well. The only snag I had was working around the Happy Trails engine guards.

My friendly tip would be to label all of your hoses/connections with a silver sharpie.
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Old 07-01-2008, 02:00 PM   #3
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Default Re: Who’s done the Thermo-Bob mod?

I have one on my 08. The bike warms up quickly now, and the temp doesn't ping-pong all over the place.

The install wasn't bad; just take your time and double-check before you cut.
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Old 07-01-2008, 02:30 PM   #4
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Default Re: Who’s done the Thermo-Bob mod?

Mine was good...but make sure you put lots of sealent on the 90 degree fitting...mine leaked...but like everyone said...it warms up fast! Garth
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Old 07-01-2008, 02:39 PM   #5
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Default Re: Who’s done the Thermo-Bob mod?

i installed my Thermo-Bob last week after work...took more time to take off the plastic and tank than the actual installation...easy as can be...gauge is in the middle now on my 80mile RT commute and in the twisties here in the hot Santa Ynez Valley...

this is one of the Mods the 650 REALLY needs...

working on a calibrated gauge sticker now to complete the upgrade...

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Old 07-01-2008, 02:45 PM   #6
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Default Re: Who’s done the Thermo-Bob mod?

Quote:
Originally Posted by Garth View Post
Mine was good...but make sure you put lots of sealent on the 90 degree fitting...mine leaked...but like everyone said...it warms up fast! Garth
Thanks to customers like Garth, the product is now improved. Since April, all kits are shipped with fittings installed. I have never heard of a leak since.
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Old 07-01-2008, 02:46 PM   #7
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Default Re: Who’s done the Thermo-Bob mod?

What is this modification?
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Old 07-01-2008, 03:07 PM   #8
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Default Re: Who’s done the Thermo-Bob mod?

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What is this modification?
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Old 07-01-2008, 03:39 PM   #9
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Default Re: Who’s done the Thermo-Bob mod?

Thanks.
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Old 07-01-2008, 03:49 PM   #10
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Default Re: Who’s done the Thermo-Bob mod?

I installed a Thermo-bob last winter. As long as the bike is moving, the temp gauge comes to rest in the same spot whether it's 20F or 90F outside.
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Old 07-01-2008, 07:48 PM   #11
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Default Re: Who’s done the Thermo-Bob mod?

I want to do it before next winter. On the highway in 40º weather, the needle was way down, close to the "too cold" danger zone all day. I covered part of the radiator grill with duct tape - didn't help a bit.

I would like very much for my bike to behave the same way as my truck (i.e. needle shoots up to one spot and stays there).
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Old 07-02-2008, 07:47 AM   #12
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Default Re: Who’s done the Thermo-Bob mod?

Very well made product, excellent installation instructions. Take your time, be careful where you cut and you'll be fine. As mentioned, the bike comes up to temperature quicker and maintains a consistent, higher than stock, temperature while riding. The only time I see it go higher is slogging through the woods at low speeds after which the cooling fan kicks in. After the doo I'd say it's the best "peace of mind" and reliability mod for the engine.
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Old 07-02-2008, 08:01 AM   #13
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Default Re: Who’s done the Thermo-Bob mod?

I wonder if any one who has done the mod if they have noticed if the fan comes on less frequently. This is the first bike I have ever own where on hot days, if had been riding slowly right before I park the bike, the fan continues to run for about 30 seconds after I turn the ignition off.
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Old 07-02-2008, 08:52 AM   #14
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Default Re: Who’s done the Thermo-Bob mod?

I am still not sure what the advantages of this product are. Is it just to keep the temperature needle in the same position, or does it improve cooling, or does it do something else?
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Old 07-02-2008, 09:07 AM   #15
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Default Re: Who’s done the Thermo-Bob mod?

Quote:
Originally Posted by Mark R. View Post
I am still not sure what the advantages of this product are ...

https://members.cox.net/watt-man/TB%20Testing.htm

https://www.klr650.net/forums/showthread.php?t=29515
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Old 07-02-2008, 01:52 PM   #16
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Default Re: Who’s done the Thermo-Bob mod?

I have done it and it works....great! What it does is keep the entire engine at a consistent temperature. No hot spots...no cold spots.
It should make a big difference in how long the engine stays together.

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Old 11-06-2008, 09:30 PM   #17
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Default Re: Who’s done the Thermo-Bob mod?

Hi Watt-Man,

I'm a really happy KLR newbie. I think I'm going to love it once I get it "adjusted" to my liking. heck, I love it even with the sore butt!

I think your mod is a great idea, and I believe in the benefits of what it accomplishes.
Also your testing methods, and quantity of date is excellent.
I have a Cummins diesel and think the same thing is going on. Haven't delved into it yet though.

I just had a couple of thoughts, maybe you could respond to. 1st, I understand the bypass is open (flowing) all the time.
Does this significantly reduce the amount of coolant going throught the t stat and radiator during times of low airflow (through the radiator), when maximum cooling is needed (say low speed trail riding)? Is this significant enough to consider not installing the kit if low speed trail riding is a frequent occurance?



2nd, can a guy opt for a lower temp t stat, say 180 degrees?

Thanks,

Greg
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Old 11-06-2008, 11:31 PM   #18
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Default Re: Who’s done the Thermo-Bob mod?

Quote:
Originally Posted by mudflats View Post
Hi Watt-Man,

I just had a couple of thoughts, maybe you could respond to. 1st, I understand the bypass is open (flowing) all the time.
Does this significantly reduce the amount of coolant going throught the t stat and radiator during times of low airflow (through the radiator), when maximum cooling is needed (say low speed trail riding)? Is this significant enough to consider not installing the kit if low speed trail riding is a frequent occurance?
This question comes up from time to time and is a good one. I've found it to only run 2 to 3 degrees warmer with the bypass still sending some coolant around the radiator. Here's why the temps barely rise with water bypassing the radiator: it relies heavily on the fact that the water is A LOT hotter than the air that is cooling it...
The factory setup has a high coolant flowrate, which results in a low temp gain across the engine (~10 degrees) and thus a low temp loss across the radiator (that same ~10 degrees when you're at steady state - remember the black line in my plots). If you bypass, say, 10% of the water around the radiator, the water slows down 10% in the radiator, and (this is key) because the delta in temps between the air and the water is really high, over 100F, the water temp drop across the radiator almost goes up that exact same 10% because it's in the radiator for 10% more time with a high delta from the air driving it. If the air was only 30 degrees above the temp of the water, this argument would not be valid.
Anyway, you then have 90% of the flow now with a 11.1 degree loss (if you will, instead of a 10.0 degree loss), and 10% flow with a 0 degree loss because it went through the bypass. That turns out to be the same BTU loss in the water as 100% flow with a 10 degree loss. Because that argument is not quite perfect, I see a tiny gain, on the order of 2 or 3 degrees in the summer over a stock bike.
To design this as a close-off bypass would have required a larger housing to accomodate a close-off thermostat and so on for those 2-3 degrees, so I stuck with the full-time bleeding setup as it would be less expensive for the end user and almost identical in performance. Hope this helps.

Quote:
Originally Posted by mudflats View Post
2nd, can a guy opt for a lower temp t stat, say 180 degrees?
Yep, I can also set you up with a 180F stat if you prefer it to the 195.
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Old 11-07-2008, 12:38 AM   #19
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Default Re: Who’s done the Thermo-Bob mod?

Thanks for the thorough bypass explanation. That answers my question.

I really liked reading your other info such as oil pressure vs oil temps. I'll be giving my bike a minute or two more to warm up before jumping on and going.

Greg
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Old 11-07-2008, 01:54 AM   #20
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Default Re: Who’s done the Thermo-Bob mod?

Quote:
Originally Posted by mudflats View Post
Thanks for the thorough bypass explanation. That answers my question.

I really liked reading your other info such as oil pressure vs oil temps. I'll be giving my bike a minute or two more to warm up before jumping on and going.

Greg
I'm trying to remember where I read this, and I will look it up again when I get a chance to make sure I am not making it up, but it is better for the KLR to warm up with a slight load, rather than an idle, especially with the choke. So choke it, start it, kill the choke, climb on and ease off. Just no wheelies till you get to normal operating temp. I will post the link to this when I find it.
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