The Kawasaki KLX300 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2021 to 2023 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 9003 is the most frequently specified bulb type across the Kawasaki KLX300 headlight data, appearing in both the high beam and low beam positions for the 2021-2023 model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains two separate filaments: one rated at 60 watts for high beam output and one rated at 55 watts for low beam output.
The 9003 operates on a 12-volt electrical system, which is standard for motorcycle applications in this class.
The bulb uses a P43t base, a bayonet-style fitting with a 43mm collar that physically determines compatibility with the headlight housing.
The 9003 designation is an ANSI standard classification recognized in the United States and Canada, which means it follows a defined set of performance and dimensional requirements rather than being a proprietary specification.
Because the Kawasaki KLX300 uses a single 9003 bulb type to serve both the high beam and low beam functions, the headlight assembly relies on the bulb's dual-filament design rather than separate bulbs for each function.
The 9003 is cross-compatible with the HB2 designation, as both refer to the same bulb specification under different naming conventions, which is relevant when sourcing replacement parts across different markets.