The Yamaha XJ750R Seca headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers vehicle production years spanning 1981 to 1983.
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 headlight positions for the Yamaha XJ750R Seca, covering both high beam and low beam functions for the 1981-1983 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60 watts for high beam output and one rated at 55 watts for low beam output.
Because the 9003 serves both the high beam and low beam positions on this motorcycle, the same physical bulb handles the full range of headlight operation rather than relying on two separate single-filament units.
The 9003 operates on a 12-volt electrical system, which is consistent with the standard automotive and motorcycle electrical architecture of that era.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm collar that physically locks the bulb into the headlight housing and ensures correct alignment of the filaments relative to the reflector.
The 9003 designation is an ANSI standard applicable in the United States and Canada. It is functionally equivalent to the international HB2 designation and is also cross-compatible with the H4 bulb type, which shares the same base and filament configuration under a different naming convention.
The interchangeability between 9003, HB2, and H4 is a recognized industry equivalency, meaning aftermarket and replacement bulbs sold under any of those designations are generally compatible with the XJ750R Seca's headlight housing.