The original linkage on the side of the motor is rigged up so that there is about 5mm of travel before the pedal movement impacts the carb. That's there to allow the transmission linkage to do its job.

I don't currently have the 5mm, so I am going to try an adjustment.
Right now there is 1-2 mm, so I will give this a try.

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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