JimmyZ1971

Thanks for the information...looks like Sunday will be spent swapping carbs which really sounds like a perfect way to spend the day. :D

Hi All I got a really good deal on a set of Z Therapy SU carbs for my 1971 240 BUT they are 3 screw and I have 4 screw on her now. I don't want to remove the existing carbs until I know there is not any compatiblity issues. I have compared them as closely as I can and cannot see any design differences...BUT....I could be missing something !!! Any ideas out there??? Also what oil/fluid do you recommend for the float chambers?? Thanks for any help. James

Thanks for the quick replies. I did drain and "flush" the fuel lines with fuel line cleaner, placed new fuel and filters before starting BUT I have not yet rebuilt or cleaned the carbs besides spray carb cleaner where I could reach. I haven't rebuilt the engine yet. I can't let the RPM's drop below ~750 rpm or it bogs out..it will not idle and it runs rough with lots of engine vibration on anything below about 1200 RPM. No backfires even when with higher revs. The car has a pretty incomplete history with some new parts, alot of original and others that have been "rigged" together so I am looking for advice on where to start. It seems like the best thing to do is to assume nothing has been done right and start with a carb rebuild and synchronization. Thanks for you help, Carl and Walter, and I look forward to talking in the future. James

I have started a restoration project on a 1971 Z that has not been on the road since 1989. Trying to keep as original as possible and trying to source some parts and answers. Finally got it started but running very rough and refuses to idle even after warming for 15+ minutes. Have replaced rotor, dist. cap and points, fuel filter, fuel pump, plugs, spark wires, oil, etc. Adjusted timing but I wonder if it might be a vacuum problem. Have replaced majority of hoses but having trouble finding vacuum controllers. Where can I find them and would these controllers be the cause of the rough running or should look elsewhere? First restoration project from this sort of condition. Thanks for your advice.