The Kawasaki KZ750 headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers vehicle production years from 1980 to 1983 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 9003 bulb is the specified size for both the high beam and low beam headlight positions on the Kawasaki KZ750 across the 1980-1983 model years.
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 rated at 55W for low beam output.
Because the 9003 serves both beam positions through its dual-filament design, the high beam and low beam headlight sockets on the KZ750 accept the same bulb type rather than separate, position-specific bulbs.
The 9003 operates on a 12-volt electrical system, which is consistent with the standard voltage found in most motorcycle electrical systems of that era.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm flange that physically locks the bulb into the housing and ensures correct alignment of the filaments relative to the reflector.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is functionally equivalent to the H4 bulb used under international IEC standards, though the designations originate from different standardization bodies and packaging may differ.
Because the 9003 and H4 share the same base and filament configuration, aftermarket and replacement bulbs sold under either designation are generally interchangeable, provided the base type and wattage ratings match the original specification.