Michael, I've decided to rebuild the carbs, the new spark plugs are extremely blackened after 10 miles. If that isn't successful, I do have a W108 to compare the Preatomizer output.

Chuck, I can let you know in a couple of weeks if I could use some carburators. Thanks for the offer. BTW, are the W8DC Bosch spark plugs hotter than W7DC plugs?

when I got it (in the summer) it had been sitting for 3 years. It seemed to run OK, though 'rich'. I wonder by running it, if the symptom of running rich, as only gotten worse.

The only other thing I did was replace the 0.6 ohm ballast resistor with a 0.4 ohm. (so it has 2@ 0.4 ohm ballast resistors, not the 0.4 and 0.6 as specified)

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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old