One service that I do right away with a new bike is to service the swingarm bearings.
I removed the swingarm-
And found that the bearings & bushings to have grease remaining, but I repacked them all with marine bearing grease for good measure.
Then I installed a T.M. Designs Baja Kit for the swingarm. The kit included a new chain guide, chain slider and lower roller. I think the green looks great!