Need a little bit of help with my 81 kz1000 LTD j model (i think)

I was changing my tire today and noticed I need a rear sprocket something serious. It's a 39t. I'm getting a new chain and sprocket set. I was just curious on the stock gearing on these bikes and if anyone knew any gear ratios for more top end. Or ones for more acceleration. Any help is greatly appreciated.

How many teeth have the front sprocket??? Rear wheel and tire size???
Both, front and rear sprocket, define the transmission ratio.

I'm running the normal 130 90 16 rear. 39t rear 15t front
Seems to be the stock set up. Sweet thank you. I got this bike halfway thru a drag build so I'm just trying to make heads and tails of this monstrosity. The more I dig the more I find.

I run 16/35 130/90-18.
Steve