Wow, I mean wow!
Very clean example of a very hard to find machine.
Almost as hard as my minty mint 84 Gpz900.
I use Michelin Macadams on my bike, great tire and they have not let me down yet.
I know an expert on these and I think he still holds the Canadian 1/4 mile record for a turbo Gpz. Woody is his name @ Woody's Cycles in Perth, Ontario. Google him, has a website and bike business and I'm sure he'll chat you up as he is a bit of an expert on that bike.
One last thing, more pictures please?
Congrats, never sell it to anyone other than me. LOL.