Recently bought a 9n
Cleaned sediment bowl it had 1/8 of clay sludge in it.
Tractor starts well but run smoothes when choke is half way out some times.
Marvel carb came with small screw turned in all the way.
Large screw was 3 turns out.
It seem like it needs small screw all the way in but not sure where to set large screw ?..
I know I could rebuild carb but looking for advice is this a carb issue ?
Could it be old gas with moisture?
Or could it be crud in tank?
Or can I adjust carb to smooth out engine it sputters when excelerateing and when engine is put on a load.
Thank you much.