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I have a 260z with 3 screw carbs. It is running so rich that the fresh oil on a fresh rebuild is dirty and fuel smelling with only 2.5 hours of driveway idle time on it. Carbon fouled plugs, toxic exhaust. You get the picture. I spoke to Bruce the other day and was given some great hints. In any case I took the pistons out today to check the needle jet height and found that no matter which way you turn the mixture screw located under the carbs -all the way in either direction it seems my jet does not move. I have included some photos. I guess I am trying to understand what part of the jet is susposed to move. I assume it is the center bit, the part that is down about 3/16 below the bridge. Is this correct. Would I actually see visual movement of the jet if I crank the adjustment screw all the way in either direction. Thanks Glenn