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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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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