The Kawasaki ZR550 Zephyr headlight bulb utilizes a 9003 size for both high and low beam functions. The replacement chart covers 1990 to 1993 model production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kawasaki ZR550 Zephyr uses the 9003 bulb for both high beam and low beam headlight positions across all model years from 1990-1993.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, distinguishing it from the ECE-standard H4 bulb used in other markets, even though both share the same physical form and P43t base.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments, one rated at 60W for high beam output and one at 55W for low beam output.
The P43t base is a bayonet-style mount with a 43mm collar, and it is the standard fitting shared between the 9003 and the H4, which are functionally interchangeable in most applications despite carrying different ANSI and ECE designations respectively.
Operating voltage for the 9003 bulb is 12V, consistent with the standard electrical systems found on motorcycles of this type.
Because the same 9003 bulb serves both the high beam and low beam positions on the ZR550 Zephyr, only one bulb type is required to service the entire headlight assembly.