The Yamaha YP400 Majesty front turn signal uses a P21/5W bulb size while the rear turn signal requires a PY21W bulb size. The replacement chart covers 2012 through 2014 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 YP400 Majesty uses two distinct turn signal bulb types across its front and rear positions: the P21/5W at the front and the PY21W at the rear, both following the ECE standard used in Europe and worldwide markets.
The P21/5W is a dual-filament bulb, meaning it carries two separate filaments within a single envelope, rated at 12V with a 21W primary filament and a 5W secondary filament, and it mounts via a BAY15d bayonet base.
The BAY15d base features two offset pins at different heights, a design that prevents incorrect insertion and ensures the two filaments are connected to the correct circuits.
The PY21W is a single-filament amber bulb rated at 12V and 21W, and it uses a BAU15s bayonet base, which has two pins positioned at the same height but offset asymmetrically around the base collar.
The amber coloring of the PY21W is built into the glass envelope itself rather than produced by a clear bulb behind a colored lens, which is a characteristic of bulbs meeting ECE amber signaling requirements.
The front and rear turn signal positions on the Yamaha YP400 Majesty (2012-2014) use bases that are not interchangeable with each other, as the BAY15d and BAU15s have different pin configurations despite a similar overall appearance.
Substituting a P21/5W in place of a PY21W, or vice versa, would not be a direct fit due to the differing base types, and the amber tint of the PY21W would also be absent if a clear-envelope bulb were used instead.
Both bulb types operate on a 12V electrical system, consistent with standard motorcycle and scooter electrical architecture.