The Yamaha VMX540 VMax uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1985 to 1987 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 bulb is the sole bulb type listed across all headlight positions for the Yamaha VMX540 VMax, covering both high beam and low beam functions for the 1985-1987 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, the same physical bulb is used for each function rather than separate bulbs dedicated to individual beam modes.
The 9003 operates on a 12V electrical system, which is standard for motorcycle applications of this era.
The bulb uses a P43t base, a standardized bayonet-style fitting that determines physical compatibility with the headlight housing.
The 9003 designation follows the ANSI standard, which is the classification system used in the United States and Canada, as noted in the specification.
The 9003 and H4 bulbs share the same dual-filament design and P43t base, making them functionally interchangeable in many applications, though fitment should be confirmed against the specific housing before substitution.