Did you change out the coil? If it still has the 6v coil, yes it needs the resistor.
This comes from the "Articles" section of this site under "12 Volt Conversion". Good article, good info!
"The total resistance of the coil plus any external resistor (if used) should be 2.7 to 3.3 ohms for a 12 volt system. This level of resistance will maintain the correct voltage and amperage in the ignition circuit. Coil resistance is measured between the plus (+) and minus (-) terminals.
Most original equipment 6 volt coils are about 1.2 ohms, while most original equipment 12 volt coils are about 1.5 ohms. In order to get to the 2.7 to 3.3 ohm requirement, a ballast resistor such as a Napa ICR13 (Approx. 1.8 ohm) can be added to these type coils. Another approach is to eliminate the ballast resistor altogether by using a replacement coil with 3.0 ohms of resistance. Two commonly available 3 ohm coils are the Napa IC14 and the Pertronix High Voltage 40511. "
So, several factors to consider.
Also, some voltage regulators are polarity sensitive. If your regulator is designed for negative ground, it will still work but may experience shorter life. If I were converting to 12 volt, I would also go to negative ground. With negative ground, you can one day convert to electronic ignition, and all modern electronics are designed around negative ground. The starter does not care.
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