Single-Fire - Electronic Ignition Systems - Harley Davidson Single-Fire Electronic Ignition System All the features of the famous Dyna "S", plus the special feature of firing the front and rear cylinders independent of each other, allowing a much more accurate timing of each cylinder The stock ignition system fires both cylinders at the same time, which works fine for the front cylinder but the rear receives the "wasted" spark when the cylinder has started its intake stroke; this can result in harder starting, increased engine vibration, backfire and raw fuel being spit back into the carb, all creating a power loss Dyno and top-speed testing have shown a dramatic improvement in power in all areas; bikes with hotter cams show the greatest improvement If you truly want to get the most out of your stock, slightly modified or all-out customized Harley-Davidson, you need a Dyna "S" single-fire ignition system Not recommended for use with OEM coils. On 84-up Harley-Davidsons, an advance weight mechanism is required. This unit must be used with special Dyna coils Tach adapter is required when using an electric tach. Not for fuel-injected models Made in the U.S.A. Fitment:

Vehicle Type	Model	Years
American	VTwin Harley Davidson FLH Electra Glide	1970-1985
American	VTwin Harley Davidson FLHC Electra Glide Classic	1979-1981
American	VTwin Harley Davidson FLHF	1970-1972
American	VTwin Harley Davidson FLHR Road King	1994-1999
American	VTwin Harley Davidson FLHRCI Road King Classic	1998-1999
American	VTwin Harley Davidson FLHRI Road King	1996-1997
American	VTwin Harley Davidson FLHS Electra Glide Sport	1980-1981
American	VTwin Harley Davidson FLHT Electra Glide Standard	1986-1987
American	VTwin Harley Davidson FLHTC Electra Glide Classic	1983-1999
American	VTwin Harley Davidson FLHTCI Electra Glide Classic	1996-1999
American	VTwin Harley Davidson FLHTCU Electra Glide Ultra Classic	1989-1997
American	VTwin Harley Davidson FLHTCUI Electra Glide Ultra Classic	1995-1999
American	VTwin Harley Davidson FLHX Electra Glide Special	1985
American	VTwin Harley Davidson FLST Heritage Softail	1986-1990
American	VTwin Harley Davidson FLSTC Heritage Softail Classic	1989-1999
American	VTwin Harley Davidson FLSTF Fat Boy	1990-1999
American	VTwin Harley Davidson FLSTN Heritage Softail Nostalgia	1993
American	VTwin Harley Davidson FLSTN Heritage Softail Special	1994-1996
American	VTwin Harley Davidson FLSTS Heritage Springer	1997-1999
American	VTwin Harley Davidson FLT Tour Glide	1980-1983
American	VTwin Harley Davidson FLTC Tour Glide Classic	1981-1991
American	VTwin Harley Davidson FLTCU Tour Glide Ultra Classic	1989-1993
American	VTwin Harley Davidson FLTR Road Glide	1998-1999
American	VTwin Harley Davidson FLTRI Road Glide	1998-1999
American	VTwin Harley Davidson FX Super Glide	1971-1978
American	VTwin Harley Davidson FXB Sturgis	1980-1982
American	VTwin Harley Davidson FXD Dyna Super Glide	1995-1999
American	VTwin Harley Davidson FXDB-D Dyna Glide Daytona	1992
American	VTwin Harley Davidson FXDB-S Dyna Glide Sturgis	1991
American	VTwin Harley Davidson FXDC Super Glide Custom	1992
American	VTwin Harley Davidson FXDG Disc Glide	1983
American	VTwin Harley Davidson FXDL Dyna Low Rider	1993-1999
American	VTwin Harley Davidson FXDS-Conv Dyna Convertible	1995-1999
American	VTwin Harley Davidson FXDWG Dyna Wide Glide	1993-1999
American	VTwin Harley Davidson FXDX Dyna Super Glide Sport	1999
American	VTwin Harley Davidson FXE Super Glide	1974-1984
American	VTwin Harley Davidson FXEF Fat Bob	1979-1981
American	VTwin Harley Davidson FXLR Low Rider Custom	1987-1994
American	VTwin Harley Davidson FXR Super Glide II	1982-1983
American	VTwin Harley Davidson FXRC Low Rider Chrome	1987
American	VTwin Harley Davidson FXRD Sport Glide Grand Touring	1986
American	VTwin Harley Davidson FXRDG Disc Glide	1984
American	VTwin Harley Davidson FXRS Low Glide	1982-1992
American	VTwin Harley Davidson FXRS-Conv Low Rider Sport Convertible	1990-1993
American	VTwin Harley Davidson FXRS-SP Low Rider Sport	1986-1993
American	VTwin Harley Davidson FXRT Sport Glide	1983-1992
American	VTwin Harley Davidson FXS Low Rider	1977-1982
American	VTwin Harley Davidson FXSB Low Rider - Belt	1983-1985
American	VTwin Harley Davidson FXST Softail Standard	1984-1990
American	VTwin Harley Davidson FXSTB Night Train	1999
American	VTwin Harley Davidson FXSTC Softail Custom	1986-1999
American	VTwin Harley Davidson FXSTS Springer Softail	1988-1999
American	VTwin Harley Davidson FXSTSB Bad Boy	1995-1997
American	VTwin Harley Davidson FXWG Wide Glide	1980-1986
American	VTwin Harley Davidson XL1200C Sportster 1200 Custom	1996-2003
American	VTwin Harley Davidson XL1200S Sportster 1200 Sport	1996-2003
American	VTwin Harley Davidson XL883R Sportster 883 Roadster	2003
American	VTwin Harley Davidson XLCH	1971-1979
American	VTwin Harley Davidson XLH1000	1972-1985
American	VTwin Harley Davidson XLH1100	1986-1987
American	VTwin Harley Davidson XLH1200	1988-2001
American	VTwin Harley Davidson XLH883	1986-2003
American	VTwin Harley Davidson XLH883DLX Sportster 883 Deluxe	1986-1995
American	VTwin Harley Davidson XLH883HUG Sportster 883 Hugger	1987-2003
American	VTwin Harley Davidson XLH900	1971
American	VTwin Harley Davidson XLS Roadster	1978-1985
American	VTwin Harley Davidson XLT	1977-1978
American	VTwin Harley Davidson XLX 1000	1983-1985
American	VTwin Harley Davidson XR	1974-1975
American	VTwin Harley Davidson XR1000	1983-1985