2006 klr 650 - 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 6 Old 01-31-2014, 08:57 AM Thread Starter
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2006 klr 650

I just bought a real clean 06 klr 650,just wondering if I should install the thermo-bob on it.Also what about the doo hickey should I address that.The bike only has 2500 miles!!
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post #2 of 6 Old 01-31-2014, 09:06 AM
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Yes the doohickey is a for sure and most of us feel the same about the Thermo-bob.

My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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post #3 of 6 Old 01-31-2014, 09:39 AM
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IMHO, upgrading the doohickey (with torsion spring) is sound maintenance on a Generation 1.

Thermo-Bob? Another forum will declare the bypass is essential, mandatory; however . . . I do not know of a single maintenance issue traceable to the stock cooling system, operating within safe limits. The thrust of the OTHER FORUM's consensus: Unless you install a Thermo-Bob, you and your bike shall be eternally damned.

TRUE BELIEVERS in the Thermo-Bob insist it enhances engine cooling; however, after the thermostats open, seems to me both stock and Thermo-Bobbed KLRs are at the mercy of the unchanged airflow and coolant circulation.

The Thermo-Bob appears to be well-made, competently engineered, thoroughly tested, and ethically marketed. The product performs as advertised; stabilizes coolant more fully, and at a higher operating temperature, than the stock system.

The merits of these operating parameter changes remain somewhat subjective; unsupported by comprehensive and specific service life/maintenance history data.

"Yer pays yer money, and yer takes yer cherce," in my view. I certainly don't think the Thermo-Bob HARMS KLRs, as does at least one forum member, who shall remain nameless!

Bottom line, your bike, your call. Configure it to please yourself, only!
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post #4 of 6 Old 01-31-2014, 09:13 PM
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My understanding of the Thermo-Bob's operation is that allows for the circulation of the coolant around the entire cylinder during warm up before the thermostat opens which makes for more even heating and consequentially less distortion of the cylinder dimensions. In my experience before I put it on the guage had two positions:really hot and really cold. After gave a range and stabilized the system. I am a believer.
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post #5 of 6 Old 01-31-2014, 10:06 PM
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Originally Posted by Trundlebike View Post
After gave a range and stabilized the system. I am a believer.
Glad you like your Thermo-Bob, Trundlebike! My riding partner, whose technical opinion I respect, likes his also, with 55,000 miles on his '08.

As mentioned, the Thermo-Bob stabilizes coolant temperature more fully, and at a higher operating temperature, than the stock cooling system.

What are the maintenance, performance, and service life consequences of the Thermo-Bob's greater coolant temperature stabilization and higher operating temperature? Improvements may indeed exist; however, don't know of quantifiable, repeatable data supporting such improvements (e.g., data indicating increased reliability/durability/performance). Don't know of any component failure from "thermal shock," or "heat-cycling" with the stock cooling system, but they may exist also.

Temperature gauge needle excursions/fluctuations don't bother me, as long as the needle stays out of the far-right red zone. Air-cooled engines experience deeper heat-cycles and temperature fluctuations without compromising reliability; I've assumed the KLR650 engine is designed and manufactured with materials, clearances, operating parameters, etc., taking into account the stock cooling system's characteristics and capabilities, or vice-versa. My only evidence supporting the premise is, high-mileage, long service life KLR650s without benefit of the Thermo-Bob.

If I'm in error, I'll surely pay dearly for my doubts and skepticism!

Again, nothing against the Thermo-Bob and its users; an innovative product, marketed with integrity. I consider the Thermo-Bob an OPTION, not a NECESSITY, as do some with evangelistic imperative.

Not that I consider the as-built KLR650 design and materials perfect and sacrosanct; I have an Eagle Mike doohickey and torsion spring, an Eagle Mike mirror/clutch lever relocation bracket, Eagle Mike upgraded subframe bolts on my Generation 1; not to mention some Allen-head machine screws replacing JIS "Phillips-head" fasteners here and there, the TPI
5-1/4"-wide rectangular mirrors w/dampers, the Tusk handguards w/spoilers, the TPI headlight bulb and relay harness, the TPI windscreen, the Cycleracks rear rack, and the Race-Tech high-output stator and heavy-duty rectifier/regulator I've installed. Plus, EBC 320-mm front brake rotor, steel-braided front brake line, and Galfer Green pads. I confess, I've even performed the "Tee mod" and the 22-cent mod!

The KLR650 ain't perfect, as it comes from the factory, and IMHO, the machine can be improved. The Thermo-Bob may certainly be an improvement.

Last edited by Damocles; 02-01-2014 at 06:56 PM.
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post #6 of 6 Old 02-01-2014, 02:29 PM
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^^ +1

I bought into the "evangelistic imperative" early on in my ownership based on some of the frightening things I read on a certain other KLR affiliated website.

I installed a Thermo-bob and have had similar results. Prior to installation the temp gauge read hot then cold, etc.

After installation, the bike quickly reaches a mid range temperature and stays there.

They sell the device on the (previously mentioned) basis that temperature difference in the head causes warping of the cylinders. After installing and owning the thing, I question whether or not this is actually to happening to anyone's KLR. I can buy into the idea that it helps get the oil to temperature faster, which I understand is good for viscosity and moisture control. But is that helpful enough to justify it?

Would I buy one again? Maybe not. I wonder if I'm just adding s**t to the bike it doesn't need.

Last edited by kyxon; 02-01-2014 at 02:33 PM.
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