How can I change my bike's alternator-output from charging a 6volt Battery to charge a 12volt battery?

I changed the bike from 6volt to 12volt, but the charging is still the same, and the battery keeps on running flat... please help??How can I change my bike's alternator-output from charging a 6volt Battery to charge a 12volt battery?the coil in the alternator isn't large enough to produce 12 volts.

You will need a transformer before the regulator 2:1 ratio to boost the voltage from the alternator coil. You will also need a 12 volt regulator

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