You can eliminate the resistor wire and it should work fine.
The resistor wire was used originally so a 6 volt coil could be used on a 12 volt tractor (it dropped primary voltage to the coil to 6 volts). However when the starter was engaged the resistor wire was bypassed so the coil received full battery voltage during cranking. This gives a hotter spark while cranking and thus more reliable starting - especially as plugs, points, etc became worn.
Just keep your 404 in good tune and you should have no starting problems.