MCS-8083698 - The Dyna S is a complete self-contained electronic ignition system. 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. - Nippon Denso Ignition -

Fitment:
Suzuki: 77-81 550/750/850/1000/1100 Four cylinder (ND); 82-83 1000 / 1100