Suzuki Motorcycle GSX1100F Katana headlight bulbs use 9003 size for both high and low beam functions. The replacement chart covers 1988 to 1993 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Motorcycle GSX1100F Katana uses the 9003 bulb size for both high beam and low beam headlight positions across all model years from 1988-1993.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
The dual-filament construction of the 9003 allows a single bulb to serve both the high beam and low beam functions, which is reflected in the GSX1100F Katana sharing the same bulb specification across both headlight positions.
The 9003 bulb uses a P43t base, a standardized bayonet-style fitting that determines physical compatibility with the headlight housing.
The 9003 is the ANSI designation for what is internationally classified as the H4 bulb type; these two designations refer to the same bulb and are generally interchangeable, though regional labeling on packaging may differ.
Because the same 9003 specification applies to both beam positions across all six model years, a single replacement bulb type is sufficient for any headlight service on the 1988-1993 GSX1100F Katana.