Honda Motorcycle CB400F CB-1 headlight bulbs utilize a 9003 size for both high and low beam functions. The replacement chart covers 1989 to 1990 production 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.
The Honda Motorcycle CB400F CB-1 uses the 9003 bulb for both the high beam and low beam headlight positions across the 1989-1990 model years.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, operating on a 12-volt system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
The P43t base is the mounting interface of the 9003 bulb. This base type is a bayonet-style fitting with a 43mm cap, and any replacement bulb must share this base to seat correctly in the socket.
Because the same 9003 bulb number applies to both the high beam and low beam headlight positions on the CB400F CB-1, a single bulb type serves the entire headlight assembly rather than separate bulbs for each function.
The dual-filament construction of the 9003 means both beam modes are contained within one glass envelope, with each filament positioned differently inside the bulb to produce the distinct beam patterns required for high and low beam operation.