I have a Zenith carb on my early 8n. I have been through it a couple of times and have sprayed through and cleaned every jet and orifice. My tank has been cleaned and dipped and the screens were cleaned at that time...maybe a year ago. I get a good flow of fuel through the carb.
Problem: No power under a load
The upper carb screw only works if it's all the way in. If I adjust it out any, it will die at lower idle. When all the way in, it idles fine. The main jet screw doesn't seem to make much difference. All the way in will kill it and so will several turns out. It runs the same from a half turn out up to 2 or 3 turns.
It seems to run fine just driving around, but when mowing it will die if I don't constantly stop and rev up the brush hog.
General stuff done to the tractor:
new distributor, points,
new plugs and wires
converted to 12 volt
all new wiring
new exhaust/intake manifold
new governor
cleaned and dipped tank...cleaned screens
the plug wires are in the correct sequence.
ps. it does appear to still have a manifold leak in spite of my best efforts with thermosteel
Problem: No power under a load
The upper carb screw only works if it's all the way in. If I adjust it out any, it will die at lower idle. When all the way in, it idles fine. The main jet screw doesn't seem to make much difference. All the way in will kill it and so will several turns out. It runs the same from a half turn out up to 2 or 3 turns.
It seems to run fine just driving around, but when mowing it will die if I don't constantly stop and rev up the brush hog.
General stuff done to the tractor:
new distributor, points,
new plugs and wires
converted to 12 volt
all new wiring
new exhaust/intake manifold
new governor
cleaned and dipped tank...cleaned screens
the plug wires are in the correct sequence.
ps. it does appear to still have a manifold leak in spite of my best efforts with thermosteel