To thermo bob or not on new bike - Kawasaki KLR 650 Forum
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post #1 of 12 Old 05-23-2018, 09:26 PM Thread Starter
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To thermo bob or not on new bike

Sorry for the beating a dead horse questions but my brand new klr comes home in a couple of days. I’m compiling a list of the nessicary things to do and wondering should the thermo bob be on the list? I want to keep the bike a LONG time and I live in scorching heat of Dallas Texas. Watt man’s research is very compelling. Take total klr bikes on the road... are the thermo bob bikes over 50%? I think watt man’s mileage is 6 figures.. thank you
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post #2 of 12 Old 05-23-2018, 11:18 PM
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My vote would be 'yes'.

Understand, the T-Bob does nothing for cooling the bike so don't look for it to do that. What it does is get the temperature up to a proper operating range and keep it there. The bike's radiator and fan are more than capable of taking care of the high end of the heat range.

Re the percentage of KLRs with T- Bobs; frankly, I'd be surprised if it was 5%.
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post #3 of 12 Old 05-23-2018, 11:31 PM
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My own experience installing it on my ‘16 is it does seem to stabilize coolant temps over a higher average of time, in other words it seems to reduce wide swings in temperature some. However, that’s not really what the T Bob is designed to do. It’s purpose is to provide even cylinder temps, which it does make total sense it would when reading his site about it and why he created it.
With that in mind, I would put it on the list as one of the first mods to do.
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post #4 of 12 Old 05-24-2018, 10:48 AM
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I'm with Tom; probably less than 5% (and probably not even that many) of KLR's are running the thermobob......though those 5% may last the longest! I could get in to a big technical discussion as to why I think the T bob is a good idea and, of course, Bill's own site has compelling data for those that care to read but the bottom line is that I believe the T bob contributes/promotes longevity and helps reduce/eliminate bore distortion due to "cold dumping". As the bore tends to stabilize after some initial number of heat cycles, this is one mod that I'd suggest be done as early as possible for the full benefit.

While the benefits of the T bob are impossible to quantify or measure, anyone with a decent grasp of mechanics can see how it's a good thing and has to help.

2 cents,
Dave
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post #5 of 12 Old 05-24-2018, 11:27 AM Thread Starter
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Dave I agree. It makes sense from strictly a mechanical/thermal standpoint
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post #6 of 12 Old 05-27-2018, 05:42 PM
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I like mine and wouldn't have a KLR without it. Thinking of getting one for my Concours now.
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post #7 of 12 Old 05-29-2018, 08:03 PM
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Necessary, no. Nice to have, yes. Save the money for a new tire.

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post #8 of 12 Old 05-30-2018, 08:59 PM
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I have a new black 2018 and did the Bob. I absolutlely love it and would do it in a second again. Constant stable temp all the time. Of course if im in stop and go traffic temp goes up and fan comes on like normal. But no more drastic temp swings. I plan on keeping my bike for a long time and its just simple known knowlege that a stable engine temp is better. No regrets.
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post #9 of 12 Old 05-30-2018, 09:52 PM Thread Starter
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I went and looked at everything on watt man’s website. The shear volume of tracking of information is very impressive. The guy probably knows how many bristles are on a standard “reach” brand toothbrush! Lol I’m for sure buying one after the break in period.
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post #10 of 12 Old 05-31-2018, 10:48 AM
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Quote:
Originally Posted by shoebox1.1 View Post
I went and looked at everything on watt man’s website. The shear volume of tracking of information is very impressive. The guy probably knows how many bristles are on a standard “reach” brand toothbrush! Lol I’m for sure buying one after the break in period.
Yep, Bill is "special"

Personally, I wouldn't wait even that long. Here's a excerpt as to my reasoning why;


Honestly I think the bore has a propensity to go out of round on the bottom end regardless......but the T bob may lessen the distortion to the extent that the rings can compensate. Cary theorized that after a number of heat cycles the bore tends to become relatively static - which is why it stays fairly stable after a 685 rebore job. The '08's and '09's have a well deserved reputation for oil burning due to the ring (re)design, not because the bores are way worse than earlier or later bikes.....this is based on my review of some of KLRCary's material as well as my discussions with Eaglemike. Cary described the bore distortion as a design issue. Mike's belief is that if you put an earlier or later piston/ring set into a virgin 2008 or 2009 bore that it would have no greater chance of being an oil burner than other years.

To recap my thoughts;

- early Gen2's ring design was poor leading to a much higher incidence of oil consumption; as the bores distorted the rings couldn't control the oil.
- KLR650's have a propensity for some degree of bore distortion due to the design (lack of support on the bottom end of the sleeve and the thickness of the sleeve)
- the bore shape tends to stay relatively static after a certain number of heat cycles which is why the 685 kits usually solve oil consumption issues (and Mike's rings seal better)
- Aftermarket sleeves such as the 705 sleeve are beefier and don't distort much, if at all.
- the Thermobob helps lessen bore distortion by greatly reducing the delta T of entering and leaving water (cold shocking the cylinder). It's logical, given Cary's thoughts on the heat cycle issue, that the benefit of the thermobob is much greater if it's installed when new or very early in the engine's life. That said, it can only help regardless of when it's installed (do no harm! :-) )

....at least that's the synopsis I've come up with after some research and discussions with the guys that have the first hand knowledge and experience on the subject.

2 cents,
Dave
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