Here’s the full story - maybe you have some suggestions. Last fall I blasted the engine (1977 evinrude 70hp) with fogging oil. Took the head cover off, and all the carbs and shot the crankcase with the fogging oil because I was afraid I had leaking exhaust plates and was getting some water in the lower cylinder. (Turns out I wasn’t) so I replaced all the exhaust plate gaskets, rebuilt the carbs, new thermostat and valves, new water pump, new plugs. New fuel pump. Put it all back together and it starts right up and runs, but smokes like crazy and when I run it in a barrel the water gets oily fast. If I run it for a minute or two, there are little black globs of something (soot? Oil?) floating around. I was hoping it was the fuel mix since I can’t think of anything else it could be, other than one mod I’ll get to ina moment. All OEM replacement parts. Nothing leaking from the carbs. Seems to idle ok and go into gear ok without stalling after I adjusted the idle. The only other thing I did was the recommended service to that engine to address a hesitation I was experiencing. The solution was to ever so slightly enlarge the holes in the carb high speed nozzles and replace the .030 idle orifice with an .032 orifice. That’s really the only thing different, other than the fuel mix being off. I was thinking since I dumped 16oz of oil into essentially 4.5 gallons of gas, it would be rich, but it’s enough smoke and oily crud that I wouldn’t feel right running it in a lake.
