The Yamaha WR250R uses a 7443 bulb size for front turn signal and 7440 bulb size for rear turn signal applications. The replacement chart covers 2008 through 2019 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Yamaha WR250R uses the 7443 bulb for the front turn signals across all model years from 2008-2019.
The 7443 is a dual-filament T20 wedge bulb rated at 12V with a 21W/5W output, conforming to ANSI standards applicable in the US and Canada.
The dual-filament nature of the 7443 means it carries two separate circuits within a single bulb, allowing it to serve two distinct lighting functions at different wattages.
The rear turn signals on the WR250R use the 7440 bulb across all model years from 2008-2019.
The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W, also conforming to ANSI standards for the US and Canadian markets.
Although the 7443 and 7440 share the same T20 wedge base and 12V operating voltage, they are not interchangeable. The 7443 carries a second filament that the 7440 socket is not wired to use, and substituting one for the other in the wrong position risks incorrect lighting function.
The T20 wedge base is a push-in connector type that does not use a separate metal base, relying instead on the glass envelope itself to make contact with the socket.
Both bulbs operate on a 12V electrical system, consistent with the standard automotive and motorcycle electrical architecture found on the WR250R.