The Kawasaki ZX636 Ninja ZX-6R uses P21W bulbs for both front and rear turn signal applications, with the bulb size remaining consistent across the replacement chart. The chart covers 2003 through 2006 production years and documents turn signal bulb specifications for the referenced motorcycle model.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21W is the sole bulb type specified across all turn signal positions on the Kawasaki ZX636 Ninja ZX-6R, covering both front and rear applications for the 2003-2006 model years.
The P21W operates at 12 volts and 21 watts, a wattage rating standard for turn signal applications where sufficient light output is required for visibility and legal compliance.
The P21W uses a BA15s bayonet base, which is a single-contact fitting. The "s" designation in BA15s denotes a single-contact base, distinguishing it from the dual-contact BA15d variant, which is not interchangeable with this application.
The P21W is governed by ECE regulations, a standard recognized across Europe and numerous other markets worldwide, reflecting a globally distributed specification rather than a region-specific one.
Because the front and rear turn signals on the ZX636 Ninja ZX-6R share the same P21W specification across all listed years, the bulb is functionally interchangeable between both positions on the vehicle.