I have only briefly read all the replies, but it doesn't seem that anyone has touched on the main problem here.

In the first post the concept being adjusted is idle speed. Here is the problem. One CAN NOT adjust idle speed on that motor and the adjustment at #2 is NOT for idle speed. It IS for fuel mixture.

Any adjustment at #2 that affects idle speed is WAY OFF proper setting. The proper mixture can only be guessed at without using measuring tools of some nature. The narrow band of proper mixture sits within the larger band of all mixtures that run the same.

Use the technique of EHA current for the best judgement of mixture.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician