Kawasaki KLR650 Tail Light Bulb Size

The Kawasaki KLR650 tail light requires a P21/5W bulb size for proper illumination. The replacement chart covers 2008 through 2018 model 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.

Bulb Size by Year Range

Years	Bulb Size
2008-2018	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

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Additional Notes

The Kawasaki KLR650 uses the P21/5W bulb for the tail light position across the 2008-2018 model years covered in these specifications.
The P21/5W is a dual-filament bulb, with one filament rated at 21 watts for the brake or turn signal function and a second filament rated at 5 watts for the running or tail light function.
The P21/5W operates on a 12-volt electrical system, which is standard for motorcycles in this class.
This bulb type follows the ECE (Economic Commission for Europe) standard, giving it broad compatibility across European and international markets.
The P21/5W uses a BAY15d bayonet base, which is an offset twin-pin base. The asymmetric pin placement prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares a similar appearance but uses symmetrically placed pins. Substituting one for the other is not possible without modification.