1958 Evinrude Fastwin 18 tune up

[aretecorp]

Having cleaned the carburator, how many turns on the low and high speed needle valves should I make to begin adjusting fuel flow? I have replaced the plugs and I am getting a good spark, but I am clearly flooding the cylinders and the engine won't start. Any advice would be appreciated.

[boats.net]

Unfortunately trial and error will be your best alternative for this one. The oldest my resources go is 1968. Also with the years of wear on the motor, the factory setting may not be accurate.