As I get one step closer to launching this old girl, new issues pop up. I just finished an o-ring job on my six gallon Evinrude gas tank fuel line fitting (it leaked bad) that now allows me to run the motor for an extended period of time (mounted on the back of the boat, lower part of motor sitting in a large trash can full of water). After a couple minutes of running, it started smoking and continued smoking until I shut it down after maybe five minutes of running time. Smoking quite a bit. Previously, when I first started it (after 50 years of not running) it smoked a little, to be expected I guess, but it probably only had 1-2 minutes total of running time prior to yesterday. The smoke was coming out the exhaust. I thought I should revisit the oil/gas mixture I was using and now believe I was too light on the oil. I had mixed 8 ounces (1/2 pint) of oil to 3 gallons of gas. What should be the mixture of oil and gas for this motor? An additional consideration – the carb was rebuilt and I have made no attempt at adjusting it yet (that’s another topic to be covered in the near future). But I don’t believe an out of adjustment carb could cause that much smoke, right? Thoughts? I just hope I didn’t potentially cause any harm to the motor.