Evinrude 33hp ski twin running poorly

[VladF]

Hey folks, I’m out of ideas. I have 1969 ski twin that I’m restoring. I’ve rebuilt the carb, changed both crankshaft seals, new fuel lines, tested the coils, and put in new spark plugs and wires. I can’t get it to run properly. The engine jerks hard when idling. I know it’s not running lean because as soon as I pull the choke the engine dies. I will attach a video of it running. If anyone has any ideas I will greatly appreciate it.

 

[racerone]

To me it sounds awful.----Sounds like it is running on one cylinder.-----Post compression numbers.----And does spark jump a gap of 1/4" (7 mm ) or more on each lead ?----Check fuel pump diaphragm.

 

[VladF]

I will check the compression. Both cylinders are firing because if I pull either plug the engine keeps running on the other cylinder. Also it’s a new fuel pump

 

[F_R]

Couldn't see your video, but could "sort of" hear it. I think I hear lean sneezes. You did try turning the slow speed needle a tad toward rich ---didn't you?

 

[VladF]

Couldn't see your video, but could "sort of" hear it. I think I hear lean sneezes. You did try turning the slow speed needle a tad toward rich ---didn't you?

Yes. No change. I did get it to ”lean sneeze“ by turning in the low needle. This stutter is something else. I

 

[VladF]

The only thing I haven’t replaced is points and condensers. Could that be an issue?

 

[oldboat1]

Yes. Try cleaning and resetting points (.020). The incoming fuel line looks like it could have a crimp -- might check that. Plug wires reversed?