Dyna S Ignition System for 1977-1983 Suzuki GS550, GS750, GS850, GS1000, GS1100The 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 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. All Dyna Coils are guaranteed against