The Yamaha FJ1100 headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers 1984 to 1985 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 for the Yamaha FJ1100, covering both the 1984-1985 model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high and low beam operation, which is why it serves both headlight functions on this motorcycle.
The 9003 operates on a 12-volt electrical system and draws 60 watts on high beam and 55 watts on low beam.
The 9003 uses a P43t base, a standardized bayonet-style mount that determines physical socket compatibility in the headlight housing.
The 9003 conforms to ANSI standards as applied in the United States and Canada, which governs its output, beam pattern, and dimensional tolerances.
The H4 bulb is the international equivalent of the 9003 and shares the same dual-filament halogen design and P43t base, though regulatory and beam pattern differences between ANSI and ECE standards mean the two are not always interchangeable in practice.