Since it has been converted from 6 volts, most likely it had a resistor added before the coil to continue to use the original coil. At best you are going to see about half of cranking voltage at the coil. Cranking voltage may be down around 10 volts.
Make sure the points and condenser are in good shape. There should be no more than .1 volt drop across any connection.
If you were to replace the magnetic starter switch (mounted on the starter) volt a 12 volt type with 4 terminals you could add a resistor bypass wire and have full cranking voltage at the coil for starting.
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