The Yamaha WR400F high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production years spanning 1998 to 2000.
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 sole bulb type specified across all lighting positions in the Yamaha WR400F headlight bulb specifications.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both high and low beam functions.
Because the 9003 serves both the high beam and low beam positions on the WR400F, both functions are handled by one physical bulb rather than two separate units.
The 9003 operates on a 12-volt electrical system and carries wattage ratings of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange width, and this base type determines physical fitment into the headlight housing.
The 9003 designation follows the ANSI standard applicable in the United States and Canada, distinguishing it from the functionally similar H4 bulb, which follows ECE standards used in other regions.
The H4 and 9003 bulbs share the same dual-filament design and P43t base, but they are not certified interchangeably across all regulatory markets due to differing photometric standards.
The 9003 specification applies uniformly to the Yamaha WR400F across the 1998-2000 model years, with no variation in bulb size between those years.