1965 3.9hp plug fouls

[Teseal]

OK so going to run on the J8C for now. Still running way to rich it seems, lots of smoke and oil in the water. Waiting for a service manual now so I can check carb/ign sync and timing.

 

[merc850]

I don't know what brand of oil you're using but I've found that Amsoil synthetic smokes less and if you live in the US you can get 100:1 blend which lets you go from 50:1 to 100:1. I was mixing it at 70:1 and of course I used less oil and reduced smoking.

 

[Teseal]

That ratio info is pretty interesting. I don't remember the brand of oil just that it's the correct spec, marine, and in a blue bottle. But I don't feel my Yamaha 40 smokes a lot nor all the other 2 cycles I use it in. But you know another thing that concerns me is all the oil in the test barrel.

 

[racerone]

Oil in a test barrel is a concern to many folks.-----I have stated it many times.----Oil / lubrication / operation / inner workings of 2 strokes is not well understood.-----Oil floating in your test barrel is normal for that motor !

 

[Teseal]

I agree, I expect to find some oil floating in there. The quantity is what is concerning me, especially after such short runs. Its not the first 2 cycle I've run in a barrel.