The Kawasaki KZ1100 headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers 1981 to 1983 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 9003 is the sole bulb type listed across all headlight positions in the Kawasaki KZ1100 specifications, covering model years 1981-1983.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high and low beam operation. This is why the same bulb size appears under both the High Beam and Low Beam Headlight categories in the KZ1100 specifications.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, which is a standardized bayonet-style mount with a 43mm collar. A bulb with a different base type will not physically seat correctly in the socket, regardless of voltage or wattage compatibility.
The 9003 is defined under the ANSI standard, which is the designation used in the United States and Canada. The same bulb is sold under the designation H4 in markets following ECE regulations, and the two are electrically and physically interchangeable.