So the other day when I was swapping out the 30s with the 32s carbs, when I was hook up my hand vacuum pump, to prime them, I did notice that it wasn't holding a vacuum.
So it's time to rebuild it, I heard that K & l Supply now offers a kit for the 88~07, as apposed to ordering 2 kits. So I ordered it (Part # 18-2702) and it's true.
So if you need to rebuild your fuel shut off valve, your all set with one kit.
Side note :ive updated the Wiki on Ninja 250 Riders Club to reflect this.
https://faq.ninja250.org/wiki/Rebuil...tcock/fuel_tap