The Yamaha SR540 SRV uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 1985 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Yamaha SR540 SRV uses the 9003 bulb for both high beam and low beam headlight positions across the 1985-1991 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both the high and low beam functions within one housing.
Because both beam positions on the SR540 SRV share the same 9003 specification, the same bulb type fits either socket, though each position draws on a different filament at different wattages.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a standardized bayonet-style mount with a 43mm flange, and only bulbs with this base type are physically compatible with the SR540 SRV headlight sockets.
The 9003 designation follows the ANSI standard used in the United States and Canada, and it is functionally equivalent to the international HB2 designation, though the two designations originate from different standardization bodies.
The halogen gas fill inside a 9003 bulb allows the tungsten filament to operate at higher temperatures than a standard incandescent bulb, which contributes to its light output and rated service life.
Substituting a single-filament bulb in place of the 9003 would not satisfy both beam functions, as the dual-filament design is integral to how the headlight assembly operates on the SR540 SRV.