The Yamaha SV125 Snosport headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers vehicle production years from 1990 to 1991 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 is an ANSI-standard halogen bulb recognized in the US and Canada, operating at 12 volts with a dual-filament design rated at 60 watts on the high beam filament and 55 watts on the low beam filament.
The dual-filament construction of the 9003 allows a single bulb to serve both high and low beam functions, which is reflected in the Yamaha SV125 Snosport specifications where the same bulb size is listed for both the high beam and low beam headlight positions across 1990-1991.
The 9003 uses a P43t base, a standardized bayonet-style fitting that physically determines compatibility and is not interchangeable with bulbs carrying different base types, even when voltage and wattage ratings are otherwise similar.
The H4 bulb is the international equivalent of the 9003 and shares the same filament configuration and base type, though the 9003 designation is specific to the ANSI classification system used in North America.
The 9003 specification remains consistent across both model years covered in the data, with no variation in bulb size between 1990 and 1991 for either beam position on the SV125 Snosport.