My main reason for suspecting the cold start was the incredibly short period of time before it smooths out & runs perfectly; really just a few seconds. I'm going to test it today for spray pattern & voltage if I don't have spray.
Does this engine have solid lifters or hydrualic?

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress