Check the listing for details. Dynatek DS6-2 Electronic Ignition System - Single Fire - H-D 1970-98 Carb Models. Condition: New. Listed at 182.99 USD. Manufacturer's Part Number: DS6-2 Suggested Retail Price: $149.95 Fits: Harley-Davidson Models 1970-1998 Big Twin Carb (exc. FI, Twin Cam) 1971-2003 Sportster H-D#32592-78 Single Fire (DS6-2) Stock replacement type ignition system is self-contained and fits under the stock timer cover. Single fire system's independent firing allows for more accurate timing of each cylinder. Increases power and reduces vibration, backfiring and intake reversion, especially on engines with radical cam timing. Front and rear cylinder timing may be set individually. Perfect for hot dual-plugged engines Unique hall-effect sensors are impervious to dirt and oil. Spark scatter is almost eliminated. Timing changes less than 3 from 0-8000 RPM. Eliminates maintenance and extends spark plug life. 1-year manufacturers warranty. Note: 1980 and later Harley-Davidson models require conversion to a centrifugal advance mechanism.