I have an '83 MM with the 2.0 in it. I have rebuilt the Carb recently and it was running great. It lacked power in the mid-high rpms so I fixed this by pulling the secondary vacuum diaphragm off completely. I replaced it with a spring running from the secondary linkage to the mount that held the diaphragm. I blocked off the one vacuum port as well. No leaks there. I have also retimed the engine to 5 BTDC, new plugs, wires, distributor cap, rotor and ignition coil . I also did a valve jet adjustment as well. All of them were off and now they are correctly gapped to.025mm per the Chilton manual. So the engine is timed and ignition is all new. I have checked vacuum lines with no leaks. When I rebuilt the carb I learned 2 things, take my time and to never rebuild a Mikuni ever again! So before I fixed the secondary diaphragm I had it running great, just no power. I now cannot get this thing to idle correctly to save my life. I'm guessing the adjustments you should not touch have been messed with before to compensate for the crappy running carb. So now that it is all rebuilt and correct I have no idea where to start on all the adjustments. Does anyone have the factory settings for the screws that should not be touched? or am I kind of up a creek with no paddle on this one? I also verified that my spring "fix" works also, it is not opening the second barrel at all until you turn the main one so far. BTW, super simple fix if anyone wants pictures to basically 'delete" the secondary diaphragm. I have looked at the other posts on here as well about adjustments and I cannot seem to find the factory settings for the screws you should not touch. I'm sorry for the long post but I'm hoping the wizards on here can help me out a little bit. Thanks for any help
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