Obviously, I'll get a Doohickey, but also a Thermo Bob?
Magnetic Oil plug? What else?
Many people replace the "Doohickey" [Balancer Chain Adjuster Lever]. There was a time when the KLR 650 had an inadequately designed "Doohickey". The time frame of the known, problematic balancer levers began with the KLR 600, the predecessor to the KLR 650, and continued until the KLR 650 design change in the 2008 model. The early doohickey was made from two pieces of stamped steel with a very crude welding job that maintained tensions on the balancer chain system. There were many cases of broken components and broken welds, as well as tensioning spring failures. The springs broke, allowing the spring to float around the oil sump.
With the introduction of the 2008 model, we found that the new styled KLR 650 had a redesigned balancer lever, machined and more durable than the earlier levers, found in the pre-08 models. To the best of my knowledge, we have no verifiable reports of a balancer chain adjustment lever failure occurring in the Generation II [2008 and newer] KLR 650. No reports of catastrophic failure. Machine shops are not overwhelmed with KLR's with wore concentric shafts. Left engine case sales have not skyrocketed, due to balancer chain wear on the Gen II bikes. We are rapidly approaching the fourth year of production of this bike with this internal component. I believe it is safe to say that the issue has been resolved by Kawasaki, and replacement is fueled more by urban myth, than by actual need.
There remains, however, a tensioning spring issue. Many reports surface that the spring that applies the tension to this lever, doesn't. The spring is too long to supply adequate tension to the lever, and is under designed, loosing the little tension it supplied to begin with. There is a solution. There are replacement spring options available from a number of sources. It is a commonly held belief that this spring should be upgraded. There is little objective, rational support for replacement of the Gen II Doohickey. It is a solution for a problem that no longer exists. Invest the money in gasoline. I swear before all that is Holy and true that you will get more appreciable return for your money.
EDIT: I truly believe the best thing a new owner with any new bike can do, is put a thousand miles on it before they do anything. This will reveal what is needed much more so than the decisions made while under the influence of infatuation and / or Kool Aid.