OEM Keihin CVK Rack 1990 WC16 Carburetor Carb Kawasaki Ninja ZX 900 ZX900 1985. May fit other years Part number 1990 WC16. Please do your research. This carb came with a bunch of others from a closed down motorcycle shop. It has been on the shelf for years. It is dirty so it will definitely need a rebuild. The throttle butterflies and pistons are not stuck. Missing one piston needle, one bowl/float and some screws. What you see is what you will receive, no more, no less.. You are buying this carb untested, as is, no returns. Please make sure it's what you need.