50esl74m Miss with video

[Keyboardman]

'74 model 50 has bad miss. Seems like it's running rich. Compression 140 on both cyls, rebuilt carbs, new stator, coils, power pack, leaf valves look good, great spark at 7/16 on open air tester. Lots of black gook coming out of the exhaust as well as smoke. Spark plugs are black and wet. Could a bad fuel pump diaphragm be letting raw fuel into the cyls? Video at https://youtu.be/9dY7oL0hBDU

 

[oldboat1]

looks and sounds fine to me. I would boat test it and let it run some. Check the temp. 50:1 mix.