One down and one to go! If you have to ask which one is done and which one is not then you are not looking closely enough. The clean carburetor on the left took about 8 to 10 hours to rebuild. I have never rebuilt a Zenith 35-40, multistage, twin port carburetor with a diaphragm, so it took a really long time. The most frustrating discovery was that the engineers placed a short screw in the middle of the carburetor to keep it all together. It only took me about 2 hours to figure out where that was and how to remove it. When I get to the second carburetor it should take me about 3 hours. I was very pleased to find that the first carburetor was not all gummed up inside and that it cleaned up very well. The first carburetor had a torn diaphragm that was probably affecting performance the last time my brother drove it. Otherwise it was in excellent condition. The Germans really built precise, well manufactured equipment in the 60's. When I get a free afternoon it will get done.