Kawasaki KDX400 Brake Bulb Size

The Kawasaki KDX400 uses a 1154 bulb size for brake applications. The replacement chart covers 1979 to 1980 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.

Bulb Size by Year Range

Years	Bulb Type	Shop
1979-1980	1154	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Older variant of 1157. 6V/12V.	1154	Check Price

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Additional Notes

The 1154 is an ANSI-standard bulb used in both the United States and Canada. It features a dual-filament design with a BAY15d bayonet base, which is a offset twin-pin base that prevents incorrect insertion by positioning the two pins at different heights.
The 1154 is noted as an older variant of the more widely known 1157 bulb. While the two share a similar BAY15d base configuration, they are not necessarily interchangeable, as electrical characteristics such as wattage and voltage ratings may differ between the two types.
The 1154 bulb is rated for both 6V and 12V operation, indicating compatibility across two different electrical system voltages. This dual-voltage characteristic was common in motorcycle applications during the late 1970s and early 1980s, when voltage standards were not yet fully uniform across manufacturers.
The Kawasaki KDX400 used the 1154 bulb for its brake light across the 1979-1980 model years, representing consistent brake bulb fitment across both documented years of the specification.