Posted by docmirror on January 27, 2023 at 19:42:45 from (23.127.217.254):
In Reply to: Ford 8N mystery posted by Jonesy54 on January 27, 2023 at 13:31:16:
The job of the choke plate is to allow for enriched mixture during cold, first start operation. Once the tractor and carb are up to temp, the choke should not be needed to maintain running. In summary, your stoichiometric ratio of air to fuel is too lean.
With the engine running and the choke partway on, let it warm up fully, try not to go too rich with the choke and foul the plugs. Get the tractor up to above 1200 RPM, may have to do this by sound if there's no tach. This will put you in the main metering range. Reduce the choke as much as possible just to keep it running.
At this point, start turning your main mixture screw out, that is anti-clockwise. The engine should pick up speed. Reduce choke as you go. Keep doing this with the mixture and choke until the tractor will run without choke at all(hopefully).
Stop now and remove one plug. If it's black and fuel fouled clean all plugs and put them back in. Start up the tractor and get it running WOT. The governor will not let it overspeed. At WOT, start slowly turning the main mixture screw in. Note when the engine looses RPM, and begins to surge. From that surge point turn the mixture screw out 1/4 turn.
Reduce the engine speed to idle. Set the idle speed to book value at 450-500RPM. You are now on the idle mixture circuit. Turn the idle mixture screw in until you note the speed decrease. It may be very slight, but it should decrease in speed as the mixture goes too lean. From that reduction in speed, open the idle mixture 1/4 turn.
From idle, advance the engine speed quickly. The engine should respond and not bog down. If it bogs down, adjust both idle and main mixture so that there is a smooth engine speed advance when the throttle is advanced. Check your plugs again, clean as needed. That should be it.
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