FyI you can tap hafe of the wave output from the CDI's stater winding, Just use a resister and or a wall-wort/stepper winding in line before the rectifier so you don't somk/fry the CDI winding just get the volts down.
Good for 10 to 30+ watts. http://www.allaboutcircuits.com/vol_2/chpt_9/2.html
just make it a 2 1/2-phase rectifier.
V1's have a 12vt stater output winding feeding the coil so i run a 35 watt headlight inline insted of the brake light resister, and use the 6vt lighting winding for rear & brake lights.