Kawasaki (Z400?) Help !? 🙂

Hello together, I signed up here because I have a few questions about a Kawasaki motorcycle. I don’t have much to do with motorcycles, it’s probably also because I don’t have a driver’s license for this, because only 16 … 🙂 I’m more active in the Ruprik tractor. So, now, but to my case. My grandfather has a Kawasaki, 4 cylinders standing. The stand only years around, was never moved. I’m also slowly getting out of it, so last summer and trying to run the thing. The battery is broken but, therefore, I could not make all the wide tours with the motorcycle, battery was simply over. In the higher speeds it always started “to spit”. If I wanted to speed up suddenly it did not come after it. I guess dirt in the carburetor ? Can also be that a little bit of petrol was in there .. The fuel hoses were a But well, I want to make the motorcycle fit again. New battery, carburetor ultrasonic cleaners, new petrol hoses new spark plugs etc. Maintenance just. Now I have search via Google pictures with different photos and have come to the conclusion that the Kawa must be a Z400. Built. 74 possibly ? I have unfortunately no data there, come only Easter again to my grandpa and motorcycle. Will however by then already have got spare parts. But I have here a picture, vi elleicht can you help me ? What is it now ? And where do I get spare parts for it ? Carburettor seals , filters etc. !