One thing that always seems to be left out of the 6 to 12 volt conversion is the fact that the 12 volt battery will crank the 6 volt starter so fast that you could probably dump the clutch and drive down the road with the ignition turn off. Maybe qualify for a hybrid vehicle tax break. The starter probably wouldn't last very long. My point is, increased starter speed is what gets these engines started when its cold or your battery terminals aren't fresh, or your points aren't perfect, or your carb is a little dirty. If you converted both the battery AND the starter to 12 volt, I don't think you would have much improvement in starting under the above mentioned conditions. Six volt starters with 6 volt batteries work just fine when everything is clean and fresh and its warm out, but the problem is all of the components degrade with time and leave you in a bad spot whereas a 12 battery with a 6 volt starter may well bail you out. Or you could always park on a hill. Been there, done that.
