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From my reseach and from what I have been told, the best way to get the lean/rich mixture correct other than by ear, is with a CO2 exhaust analyzer
CO2 reading for the 220/8 200/8 230 and 250 for model 68-70 at idle (900RPM) is 2.0 to 3.5%
After 71 it goes to 1.0 to 2.5 % There are many other specifics in the test procedure, but I do have all the data if you ever need it.
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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD 
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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