Thank you all
Stuart Fields a very experienced Safari builder and owner found the
solution:

Oil smoke. I found a depression in the crankcase below the cylinder(I think
it was #4) that held a couple of tablespoons of oil. It can bleed down into
the cylinder. I drilled a 1/4" hole in the bottom of the depression to
drain this oil down into the crankcase. This oil does not collect in a
horizontal mounted engine. This mod stopped my engine from doing the smoky
start like the one being described here. The only way I found the
depression was searching for the problem, I pulled the cylinder suspecting
valve troubles. When I found no valve problem, I continued looking until I
found the puddle of oil setting there. Apparently it is the only spot in
the crankcase to collect the oil in such a manner as to make it avalible to
get down into the cylinder and out thru the exhaust.
Stu