The Suzuki Motorcycle GS650 headlight uses a 9003 bulb size for both high beam and low beam functions. The replacement chart covers 1981 to 1983 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.
The 9003 bulb is the sole headlight bulb type listed across all model years and positions for the Suzuki Motorcycle GS650, covering both high beam and low beam functions for 1981-1983.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60 watts for high beam output and one rated at 55 watts for low beam output.
Because the 9003 serves both the high beam and low beam positions on the GS650, a single bulb type handles the full headlight function rather than requiring separate bulbs for each lighting mode.
The 9003 operates on a 12-volt electrical system and uses a P43t base, which is a bayonet-style mount with a 43mm collar width that physically determines fitment compatibility.
The 9003 designation follows the ANSI standard applicable in the United States and Canada. It is functionally equivalent to the international HB2 designation and the European H4 bulb, though physical base tolerances between these standards can affect interchangeability in practice.
The P43t base of the 9003 is not interchangeable with single-filament halogen bases such as H1, H3, or H7, as those use different base configurations and pin arrangements.