Well, except for March to April of 04....
The BEST thing you should do is get the VIN number, go to the Kawasaki website and punch it in. It will tell you WHAT style bike you have and WHAT recalls need to be performed on your bike. But like mentioned before, if you have a petcock, unless you don't know where that is. If you have a CARB unless you don't know the difference between that and a fuel injection manifold (the bowl on the carbs should help) and if you hadn't noticed a Fi light on the speedo, these ALL are plenty good clues.
BUT, it's pretty fun finding out things about your bike, if'n their the good things. I recently bought a F150. I decided after much thinking and a couple of trips to the store to cut a 2x6 to fit across the back of the truck in front of the wheel wells to stop the groceries from sliding forward. While measuring I noticed that there was an indentation on the far side, that matched the indentation on my side. Hot DANG, it's setup for a 2x4 or 6 or more for just the reason I was going to use it for! Now maybe that's standard, I don't remember it on my old F-150 but I didn't haul much more than dirt with it, but I was suprised. Great minds thinkin alike Me thinks.
Those kind of surprises are always good. Ok, so I measured twice and STILL cut the board to short, I'll get another. But my surprise was a lot better than thinking you've got a carbed bike, you're out on a lonely stretch of highway and the bike sputters from being out of gas so your reach over for the petcock to go to reserve and find out you have an Fi bike and you are SOL. I don't know if the 1500 Fi's have a fuel light or if that is part of the display, but my 900 has a fuel light that you used instead of getting those couple of mis-steps before you hit the petcock.
Oh, and hitting the petcock KNOWING that you have a carbed bike and finding it already on reserve? That sucks too. Big time.
I only had to push it about 3 miles...