So that must be the centrifugal oil spinner/cleaner/filter that needs periodic cleaning starting at 7500 miles. I'll have to get the service manual to see how to service that. Looks like you service it from the right side. Helm says my manual well be here in 3-7 business days. Thanks.
That looks heavy and spinning I could see lots of no so smart people removing it to lighten up the motor. Kind of like lightening a flywheel. Not saying its a good idea but I still kind of see it happening to some bikes. Wish they would have just put a normal filter on the darn thing. Would have been even nicer if it was the same as my 150r and 250x cause I have a pile of them.