Has the carb been sitting awhile? If the power piston is stuck in the down position, you'll get the lean pop. To check if stuck, get a small flashlight and a long flat blade screwdriver and insert it down the vent tube at the front of the carb. gently try to push down on the power piston arm assembly. If it doesn't move, remove the airhorn and gently pry it up and out of the bore it sits in. Then just polish it with some crocus cloth, and reinsert it making sure it isn't sticking. Should do the trick.
Paul
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1973 Z28 Street-touring project.........
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