Mike240Z Posted June 4, 2010 Share Posted June 4, 2010 Hi - new to me is a 72 240Z. Motor seems strong but fuel mixture too heavy. Working with a mechanic to try to set it right. His manual shows SUs with screw at base to set the gas mixture. Mine don't have the screws so he's at a loss on how to adjust. Can anyone help? Thanks, Mike Quote Link to comment Share on other sites More sharing options...
T-Bone028 Posted June 4, 2010 Share Posted June 4, 2010 Buy the movie, "Just SU's" from Ztherapy. Quote Link to comment Share on other sites More sharing options...
johnc Posted June 4, 2010 Share Posted June 4, 2010 Download the factory service manual. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted June 4, 2010 Share Posted June 4, 2010 Download the factory service manual. from xenons30.com Quote Link to comment Share on other sites More sharing options...
Mike240Z Posted June 4, 2010 Author Share Posted June 4, 2010 Thanks! I've got the manual. Mike Quote Link to comment Share on other sites More sharing options...
at-jefft Posted June 4, 2010 Share Posted June 4, 2010 Check out step 4: Here Quote Link to comment Share on other sites More sharing options...
Mike240Z Posted June 16, 2010 Author Share Posted June 16, 2010 Hi - I've found and read the material and talked with my mechanic. The material references more than one type of carb. The one in the pics shows two screws on bottom. The SUs on my car do not have the screws on the bottom - so we're not sure how to make the adjustments. Any thoughts? Thanks, Mike Quote Link to comment Share on other sites More sharing options...
DCZ Posted June 16, 2010 Share Posted June 16, 2010 Hi - I've found and read the material and talked with my mechanic. The material references more than one type of carb. The one in the pics shows two screws on bottom. The SUs on my car do not have the screws on the bottom - so we're not sure how to make the adjustments. Any thoughts? Thanks, Mike If you have stock-ish '72 SUs the fuel mixture is indeed at the bottom, but it is more of a knurled "nut" than a screw. Maybe someone has replaced your carbs with downdraft webers? Pics would help. Quote Link to comment Share on other sites More sharing options...
Mike240Z Posted June 16, 2010 Author Share Posted June 16, 2010 Thanks - will try to get photos, probably by tomorrow. Quote Link to comment Share on other sites More sharing options...
Mike240Z Posted June 16, 2010 Author Share Posted June 16, 2010 Cannot get underneath car well enough for a good pic. Will try from a lift tomorrow. Is a top down view of any value?Carb 1.pdf Quote Link to comment Share on other sites More sharing options...
Zmanco Posted June 16, 2010 Share Posted June 16, 2010 That's a factory SU. If you follow an imaginary line straight through the black knob on top to where it would come out under the carb, that's where you'll find the mixture adjusting nut. It's large, around 1" across or so. The FSM is adequate, but it sounds like you might be better off with the ZTherapy video. It's got lots of shots of the carbs off the car so you can more easily visualize it. They also give you step by step instructions. Plus Bruce and Steve are very helpful. I think Bruce hangs out mostly at classiczcars.com. Quote Link to comment Share on other sites More sharing options...
blue72 Posted June 17, 2010 Share Posted June 17, 2010 (edited) Looks like you've got a standard 3 screw SU setup. DCZ is right, it is more of a large knob than a screw and they come in a couple of varieties. Here are a couple of mine with an arrow to show where to find them: Edited June 17, 2010 by blue72 Quote Link to comment Share on other sites More sharing options...
Mike240Z Posted June 17, 2010 Author Share Posted June 17, 2010 Hi - thanks for tips and pics. I've passed onto mechanic and hoping he can make it work. Also, looks like it's time for me to order the video. Thanks again for your help and I'll see what happens! Mike Quote Link to comment Share on other sites More sharing options...
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