The Yamaha WR250X high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production years spanning 2008 to 2011.
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 headlight bulb type specified for the Yamaha WR250X across all documented model years.
The 9003 is an ANSI-standard designation used in the United States and Canada, corresponding to the internationally recognized HB2 or H4 bulb type.
As a dual-filament halogen bulb, the 9003 serves both the high beam and low beam functions within a single unit, operating at 60W for the high beam filament and 55W for the low beam filament.
The WR250X (2008-2011) uses the same 9003 bulb for both the high beam and low beam headlight positions, meaning one bulb type handles the full headlight assembly.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is not interchangeable with single-filament bases such as P14.5t, which is found on H1 or H7 bulbs.
The operating voltage of the 9003 is 12V, consistent with the standard electrical systems found in motorcycles of this type.
Because the 9003 is a dual-filament bulb, substituting it with a single-filament alternative would result in the loss of either the high beam or low beam function, as a single bulb cannot replicate both outputs independently.
The P43t base is a defining fitment constraint. Bulbs sharing similar wattage or voltage ratings but carrying a different base type are physically incompatible with the WR250X headlight socket.