Kawasaki KDX400 Tail Light Bulb Size

The Kawasaki KDX400 tail light uses a 1154 bulb size for replacement applications. The replacement chart covers vehicle production spanning 1979 to 1980.

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 the United States and Canada. It features a dual-filament design with a BAY15d bayonet base, which uses offset pins to ensure correct orientation during installation. It is an older variant of the more widely known 1157 bulb.
The 1154 bulb is rated for both 6V and 12V electrical systems, reflecting its use across a range of vehicle platforms from different eras of production.
The Kawasaki KDX400 uses the 1154 bulb for the tail light position across the 1979-1980 model years.
The BAY15d bayonet base of the 1154 is a dual-contact base. The offset pin spacing distinguishes it from single-contact bayonet bases and prevents incorrect bulb insertion.
Because the 1154 is an older variant of the 1157, the two bulbs are not confirmed as interchangeable in this application. The 1157 operates on a 12V system with different wattage ratings, and substitution without verification of electrical compatibility may affect circuit performance.