Glennster's Ideas are good. A couple more analysis ideas. The cap and rotor that were switched were possibly good. (the other tractor ran) The coil can draw current and not fire high voltage out the tower. Sapping the coils to the other tractor would eliminate that factor. The possible differences in humidity can cause the issue (depends on weather conditions and it is common. Dry out the cap and rotor, then use silicon spray in the inside (of the cap and rotor, not the points) to reduce moisture condensation and try it again. A weak ignition switch with high resistance or a partially broken wire to the coil from ign sw. can also let there be spark but no fire. If 12volt it should have at least 10 volts at the coil terminal connected to the ign sw when cranking. If 6 volts, it needs about 5 at the coil when cranking. Any less than these numbers will not reliably spark. Pull start the (first) 400 to see if it runs easily that way. If it does not, it is much easier to find the grief. JimN
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