It appears to me that the alignment marks where the rear axle goes through the slots are off quite a bit. Has anyone noticed that?
I measured from a rod stuck through the unused mounting holes on the engine on both sides to align the rear wheel. Plus a straight edge on the sprockets to check. Maybe since the chain is so long that the alignment is not that critical.

I don't have a spacer like axa nor did I have one on my ex 2010. Not saying it is not needed.

Of course watch the clearance between the wheel and tail light wiring. I am looking at moving the tail light a bit up the fender. I really don't want to chop the fender since I seem to riding in the mud and wet so much.

Like Bob's air cleaner solution.