When the model N gave way to the NB, so too did the model K. Debuted in late 1923 under the new designation of KA, these engines were the first to have a magneto as standard equipment.  Later on in 1924 the Wico EK and sparkplug was made available and the ignitor remained available as a special order item.  The KA featured a much wider flywheel rim that was crowned for use as a belt pulley.  Many also dispensed with the dash pot when the fuel filler was relocated.  The KA was available in the same sizes as the K however, by 1928 the 9 and 12 hp engines were not listed in catalogs.