Completely self contained electronic ignition system Hall effect style ignition which uses magnetic pickups to trigger the spark See below for availability of fire version Uses 5 ohm coils for street use and 3 ohm coils for race use Includes mechanical advance unit Not legal for sale or use in California, or on any pollution controlled vehicles V-FACTOR Single Fire Electronic Ignition Fits Big Twin models 1970/1999 & Sportster models 1971/2003 Note: Will not fit EFI models, Twin Cam or Sportster 1200S