Its basically failure of the spring on the balancer tension chain breaks Here is a link to a video about it ! Some guys change it right away others never have a problem Kawi says they fixed it
In addition to the doohicky, I would consider a thermobob kit, I like to see constant water temperature
Allowing water circulation during warm up is normally a good thing.
One of the most memorable days I had on a motorcycle was riding a friends Yamaha 500 single it was pleasant and fun.. If you want to run a syn you can at any time you want. Frequent oil changes are good.
In addition to the doohicky, I would consider a thermobob kit, I like to see constant water temperature
Allowing water circulation during warm up is normally a good thing.