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A proper ignition coil for these single-cylinder engine applications should have a minimum primary resistance of 3.2 ohms, measured across the primary terminals (threaded posts).  Due to the fact that the dwell time (points closed) is high on a single cylinder-engine, this causes the coils to run hot.  There are coils available with a resistance of 1.2 ohms...these are designed to be used either with a ballast resistor or an electronic ignition system.  These coils should NOT be used on single-cylinder engines as breaker points will quickly deteriorate due to the high current draw.  The original Delco coils had a primary resistance closer to 4.0 ohms which is desirable.  Thus, a 12V coil with resistance of 3.2 - 4.0 ohms is ideal for the single-cylinder Kohler.


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