The Dyna S is completely housed behind the ignition cover and uses a magnetic rotor with the original spark advancer, so the factory advance curve is maintained. Dyna high tech coils for Harley-Davidson Big Twins and Sportsters are American made, top quality performance coils. Tested and proven on street, racing, and touring motorcycles for over fourteen years. Dyna coils produce spark voltages in excess of 30,000 volts and spark energies second to none. See Additional Information for fitment.

• Complete electronic ignition systems built with the latest state-of-the-art engineering
• The same ignition used by top drag and road racers to set records and bring home victories over the past decade
• The Dyna S is completely housed behind the ignition cover and uses a magnetic rotor with the original advance unit, so the factory advance curve is maintained
• Coils provide spark voltages in excess of 30,000V and spark energies second to none
• Made in the U.S.A.
• Later models will require the use of a mechanical advance unit.
• Not for fuel injected models.

Note: There are no returns on carburetors, electrical items, full frames, hardtails or made-to-order items (such as magnetos) unless there is a manufacturers defect.