I've been trying to find the cause of a surging poor running issue on my 1949 front mount 8N . I remember reading here that 90 percent of perceived carb problems are electrical. I think I'm at 100 percent thru the electrical with new, cap, rotor, points, condenser, coil, ballast resistor, and ignition switch. I have a strong blue spark jumping 3/16 gap immediately after surging starts. Have cleaned all three gas filters (weren't really dirty). I get different flow from bottom of carb. With valve two turns out it is slow. With valve all the way on reserve it is about pencil thick and fast. The gas tank doesn't appear to be very dirty inside from what little I can see. Running time can differ from 15 min to one hour before it acts up. Working under load brings it on quicker. The tractor is much harder to start than it used to be. Several years ago I tested my engine and compression was in the 100's. It doesn't burn oil or foul plugs and has good oil pressure. I would say it is a strong running engine.
I'm totally confused in which way to go, I'm thinking it has to be in the carburetor at this point?? My assumption is that since all my gas filters were clean it can't be the gas tank although I think the sediment bowl valve is not working in the 2 turn position. Entertaining any ideas. I have to leave the tractor at it's remote location but thinking I should pull the carb and order some rebuild parts.
I'm totally confused in which way to go, I'm thinking it has to be in the carburetor at this point?? My assumption is that since all my gas filters were clean it can't be the gas tank although I think the sediment bowl valve is not working in the 2 turn position. Entertaining any ideas. I have to leave the tractor at it's remote location but thinking I should pull the carb and order some rebuild parts.