Can you get a headlight to fit a crf 70 Honda?

Yes you need to get new stator to generate the voltage, and a voltage regulator to limit the voltage. Add a switch and headlight. Beatrice cycle sells a stator that's a direct bolt in to replace the stator on the bike (stock stator only generates the spark energy). It will be A/C but will work fine, but only when engine is running. If you want to have a battery added to it you will need to get a voltage regulator/rectifer to make D/C.