Okay you got me....wrong thread.....but think about it.
I think it has Wirges pipes so they would need a clean - the front cone has a baffle that loads up with oil and chokes it down.bid, bid , bid. besides air filters see any thing else it need?, beside getting it to run and a title . ( do i have 4k you ask, yes)
The tank was probably designed for a Brit bike or some other single tube backbone bike, it sticks up in the rear because where it transitions for knee dents it sits on top of the frame. Looks like an old Gus Kuhn shape but I didn't think he made alloy. I'm guessing you lose about a gallon of capacity with it mounted that way.Was it the Wirges or Dencos that perform worse than the stock pipe? The tank seems to be at an odd angle to the frame at the back.
I forgot about Aus. The big fuckoff rear stainless fender is the giveaway, American bikes did not have them.