On the Blackberry, so can't do links too well. Google it and you should come up with a xanga page for Bill Watson, who makes them. I think they are $105 for the kit.
KLRs don't have a radiator bypass system like most modern bikes and all cars do. That's why they run pretty cool - all the coolant is going through the radiator. The cooling system doesn't hold the system to a constant temperature. The Thermo-Bob fixes that. Bill's site is very comprehensive and explains all. The product is of first rate quality and easy to install in a couple of hours.
I don't consider it a 'must have' item like the doohickey, but it is a Very Good Thing (tm).
I have one - it works flawlessy in all ambient temps to hold the cooling system at about halfway on the guage.
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