Yamaha XT250 front turn signal bulbs measure 1157 in size, while rear turn signal bulbs measure 1156 in size. The replacement chart covers 2008 to 2020 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 XT250 uses the 1157 bulb for the front turn signals and the 1156 bulb for the rear turn signals across the 2008-2020 model years.
The 1157 is a dual-filament bulb, meaning it carries two separate filaments within a single envelope, allowing it to serve two lighting functions at different wattages.
The front turn signal 1157 bulb operates at 12V and draws 21W on its primary filament and 5W on its secondary filament.
The 1157 uses a BAY15d bayonet base, which is an offset dual-contact base. The offset pin placement prevents the bulb from being seated incorrectly.
The rear turn signal 1156 bulb is a single-filament type, operating at 12V with a 21W output dedicated to one function only.
The 1156 uses a BA15s bayonet base, which is a single-contact base. This base is not interchangeable with the BAY15d base used by the 1157, despite the two bulbs sharing a similar physical profile.
Although the 1157 and 1156 share the same 21W primary wattage, substituting one for the other is not supported by these specifications, as their base types and filament configurations differ.
Both the 1157 and 1156 are ANSI-standardized bulbs, meaning their electrical and physical characteristics conform to a defined North American standard used across many vehicle types.