A to Z Posted September 5, 2021 Share Posted September 5, 2021 240Z SU's. The instructions on how to tune them make ZERO sense. First of all the mixture "screw*". It isn't a screw* at all, it is a wheel with 5 to 6 detents in it. So telling me to turn it 2 full turns out is impossible. Next, the Carburetor Balancing Adjustment Screws*. They tell you to turn both out then back into 1.5 turns. You CAN'T. You only have ONE Balancing screw*. The screw on the front carb is an Emissions Control Adjusting Screw. It has NO adjustability at all! The remaining 2 screws*, which are near the flange where the carbs bolt to the manifold are called "Idle R.P.M. Adjusting Screws*".....can't use those for sync'ing the carbs. So, if all the information out there asks you to make adjustments you can't.....then what?? Quote Link to comment Share on other sites More sharing options...
Miles Posted September 5, 2021 Share Posted September 5, 2021 Go to Z therapy website and buy the video "JUST SUs" it will explain how the SU carb works and how to tune it. Watch the video over and over again until you understand the SU tuning procedure before tinkering with the carbs. https://www.ztherapy.com/ Quote Link to comment Share on other sites More sharing options...
dorishall Posted November 1, 2021 Share Posted November 1, 2021 (edited) Thank you, this question was also relevant to me. slope game Edited June 18, 2022 by dorishall Quote Link to comment Share on other sites More sharing options...
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