Lots of people lean them out while running until the engine stumbles, at which point you can enrich it by 1/8 turn or so. Lefty leany, righty richy.

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,