The Yamaha MT-09 front turn signal requires a P21/5W bulb in 7443 size, while the rear turn signal uses a P21W bulb in 7440 size. The replacement chart covers 2018 through 2021 model 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 MT-09 front turn signal position uses a dual-filament bulb across all listed years, drawing 21W on the main filament and 5W on the secondary filament at 12V.
For the 2020-2021 MT-09, the front turn signal takes a P21/5W bulb, which follows the ECE standard used in European and worldwide markets. It uses a BAY15d bayonet base.
For the 2018-2019 MT-09, the front turn signal takes a 7443 bulb, which follows the ANSI standard used in North American markets. It uses a T20 wedge base rather than a bayonet fitting.
The P21/5W and 7443 share identical wattage ratings but have physically incompatible bases, meaning one cannot substitute for the other despite matching electrical output.
The Yamaha MT-09 rear turn signal position uses a single-filament bulb across all listed years, rated at 21W and 12V, with no secondary filament.
For the 2020-2021 MT-09, the rear turn signal takes a P21W bulb under the ECE standard, fitted with a BA15s bayonet base.
For the 2018-2019 MT-09, the rear turn signal takes a 7440 bulb under the ANSI standard, using a T20 wedge base.
The P21W and 7440 are electrically equivalent single-filament bulbs but are physically incompatible due to their differing base types, one bayonet and one wedge.
The shift from ANSI-standard bulbs in 2018-2019 to ECE-standard bulbs in 2020-2021 affects both the front and rear positions, indicating a market-region change in the bulb specification across those model years.
The front and rear positions across all listed years are not interchangeable with each other, as the front requires a dual-filament bulb and the rear requires a single-filament bulb, regardless of regional standard.