The Yamaha XC155 SMAX high beam and low beam headlight bulbs both utilize a 9003 size. The replacement chart covers vehicle production spanning 2015 to 2020 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 sole bulb type specified across all headlight positions for the Yamaha XC155 SMAX, covering both high beam and low beam functions for the 2015-2020 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 the high beam and low beam positions on the XC155 SMAX, both positions draw from the same physical bulb unit rather than separate dedicated bulbs.
The 9003 operates on a 12V electrical system, which is standard for motorcycle and scooter applications in this class.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type determines physical fitment and is not interchangeable with bulbs carrying different base designations.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is functionally equivalent to the H4 bulb used under European ECE standards, though housing fitment compatibility depends on the specific socket design.