A thought on this thermobob thing - 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 10 Old 01-09-2010, 05:02 AM Thread Starter
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A thought on this thermobob thing

Just a thought, and I'm seeing two camps here, the for and the against, or just don't want to fork out the money for the bob thing. It occurred to me that having the coolant temp rise and fall while the motor was running and riding, that a colateral effect of this would be the carburation running from rich to lean, rich to leam, ets, back and forth, giving a somewhat poor carburation to the engine, even when compensated for with either a carb kit or the needle adjustment. Anybody think they are experiancing this symptom? Thus it could be argued the need for a 'bob' to keep the temps at a 'mean', and clean up carburation.
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post #2 of 10 Old 01-09-2010, 10:53 AM
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Gohot229 -

Mine got installed yesterday and before it was finally ordered I looked at all the pros and cons. Can't say I ever ran across that one, nor can I say that I recall any such effect.

For me, it just comes down to "an engine should run at a fairly consistent temperature in all conditions". While in the grand scheme of things it may not be overly beneficial, it can't be bad.

Tom

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post #3 of 10 Old 01-09-2010, 12:05 PM
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Actually is does help stabilize the mixture. The late great klrCary had commented that this made things better, mixture wise as well as other ways.

all the best,
Mike
(I have have one on my klr. I make them for Bill)
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post #4 of 10 Old 01-09-2010, 08:29 PM
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A warm engine burns fuel better than a cold one.

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 #5 of 10 Old 01-09-2010, 08:30 PM
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Quote:
Originally Posted by eaglemike1 View Post
Mike
(I have have one on my klr. I make them for Bill)

And a mighty fine job you do of it too!!

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 #6 of 10 Old 01-10-2010, 06:17 AM Thread Starter
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Honestly, I have no KLR, but I am in the quest to aquire an 08-09, but dwelling on the temp issue, one would have to asume that with a rise and fall of temps entering the combustion chamber at different ambient temperatures, there would be a variation in combustion charactoristics from a (cold) motor to a (hot) motor (this is oversimplified) but with an average (mean) temp there would be uniform combustion chamber temperatures thus a consistant flame travel, this in turn would stabilise the jetting/needle tune of the carb.
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post #7 of 10 Old 01-10-2010, 11:21 AM
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I'm not saying it's a bad or good item, but I'll say thay my 02' KLR has been ridden in 100+ to 20 degree temps and it runs just fine in that 80+ degree range.. I've ridden it all day at 45-50 degree weather and it started, ran, and accelerated perfectly all day, every day..

And for 19,000 miles it's done this without a thermobob.. In fact, I didn't know what this item was until about 9 months ago, and I'm still learning about..

That said, I would put this down around the zero concern level when it comes to deciding on whether or not to buy a KRL..

Over the years I've installed a lot of modifications to my bike. I'm not saying that I won't ever install a Thermobob on my bike, but it's not currently on my list of "must haves"..
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post #8 of 10 Old 01-10-2010, 05:50 PM
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I installed the t-bob on my 08 a few days ago and it honestly makes the bike run better in this cold weather. It runs warmer on the road and the temp gauge is a lot steadier in stop and go riding also. No experience yet in warm weather, but I'm sure it couldn't hurt.
The reason I say this is because back in my college days, I took a late 70's small block chevy into engines class that had over 200,000 miles on it with some bad cam lobes and running weak. I pulled it from a family members car.
I took this engine in expecting to get to bore it and do a complete overhaul because I just knew it was completely worn out. I was shocked to find the cylinders near perfect specs when some of the other guys engines with less miles had to be bored and some even sleeved. The only down fall here was I never got to run the boring machine......lol
My engines instuctor said that my engine must have been running nice warm steady temps.
I've read in other places of some inline 6's where the #1 cylinder was completely worn out. I can't say for certain it's the shock of cooler coolant hitting that cylinder or a lubrication problem or something else causing it, but I've personally worked on some inline 6's with that very problem. Makes ya wonder.
My 08 uses ALOT of oil (to me) and I will always wonder if.... "what if".... I'd installed the t-bob before I put over 12,000 miles on it.
Oh well, it's in place now for when the 685 goes in.
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post #9 of 10 Old 01-11-2010, 11:42 PM
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The thermostat is not a new invention to the water cooled engine. Otherwise we would not need a choke. lmao
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post #10 of 10 Old 01-12-2010, 02:04 AM
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Paper ask yourself why the majority of liquid cooled egines have a coolant bypass.
Kawasaki doesn't have the coolant bypass on some of their bikes but I think that is because they are Cheap. They were so Cheap they did not add a factory coolant bypass for the fuel injected Versys. Why do I bring this up? The Versys is one of the motorcycles I want and that means I have to spend more money to bring it up to par. Darn Kawi engineers
If you installed a Thermo-Bob and did not see a difference with your KLR then someone should do a DNA analysis of it.

Tim

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2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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