In pre-2008 models, the doohickey had a bad habit of breaking into pieces, which could be catastrophic for the engine. This part was significantly strengthened in the 2008 and later model, but some still complain that the spring is not strong enough/wears out too easily and results in unnecessary wear and noise from the balancer chain. So, one could say that replacing this part isn't mandatory in the 2008 and later model, but many who are particular about the longevity of their engines will replace the part.
If you want lots of how-to's, etc., check out the KLR650.net forum. You'll find write-ups on cheap boxes, tool tubes, etc.
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