Excessive smoke probably indicates it's running rich. Those D-400 primer plungers are notorious for o-ring failures at the end of that plunger. When that happens it sucks up excess fuel through the primer. When you completely close the main needle and it continues to run, and run rich, it's a pretty good indicator that you have another path for fuel going to the venturi. I also wonder if your float is okay? set properly and not sinking in the fuel?Finally got back to the Loafer. Motor is complete, but it's giving me fits. The motor runs (poorly) for a bit, backfires and dies. I have rechecked the point gap, and rechecked the coil gap. Set the points at .016, the coil at .010. I am not sure what else to do at this point. I would like to get some tips, before I do some real damage. Also, what is a good starting point for the carb setting on this mower? Thanks Greg
PS There seems to be an excessive amount of smoke. 16:1 ?
For the starting setting on those 2 speed carbs, don't quote me, just going from memory, but I think the low speed needle 1 turn out, and the main needle 2 turns out.