The Yamaha YZF-R3 front turn signal requires a 7443 bulb size while the rear turn signal uses a 7440 bulb size. The replacement chart covers 2015 through 2020 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 Yamaha YZF-R3 uses two distinct turn signal bulb types across its front and rear positions, both belonging to the T20 wedge family and sharing the same 12V operating voltage.
The 7443 bulb is a dual-filament T20 wedge type rated at 12V with a 21W primary filament and a 5W secondary filament, conforming to ANSI standards applicable in the US and Canada.
The 7440 bulb is a single-filament T20 wedge type rated at 12V at 21W, also conforming to ANSI standards applicable in the US and Canada.
The front turn signal position on the YZF-R3 calls for the 7443 bulb across the 2015-2020 model years.
The rear turn signal position calls for the 7440 bulb across the same 2015-2020 model year span.
Although the 7443 and 7440 share the T20 wedge form factor and the same 21W primary filament rating, they are not interchangeable. The 7443 carries a second filament that the 7440 does not, which affects the physical base configuration and electrical behavior.
Substituting a 7440 into a 7443 front position would result in the loss of the secondary filament function, which in automotive and motorcycle applications typically serves a parking or running light role.
The dual-filament construction of the 7443 means its base is keyed differently from the 7440 to prevent incorrect installation, though both use the wedge-style base common to the T20 family.