Honda Motorcycle CB750K high beam and low beam headlight bulbs both utilize a 9003 size. The replacement chart covers vehicle production spanning 1981 to 1982.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 is the sole bulb type listed across all headlight positions for the Honda Motorcycle CB750K, covering both the 1981-1982 model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high and low beam operation, which accounts for its use in both headlight positions on the CB750K.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, a standardized bayonet-style fitting that determines physical socket compatibility during replacement.
The 9003 designation follows ANSI standards applicable in the United States and Canada, distinguishing it from the functionally similar H4 bulb used in other markets, which shares the same dual-filament halogen design but uses a different base designation recognized under European standards.
Because the high beam and low beam headlight positions on the CB750K share the same 9003 specification for both listed years, the two positions accept the same physical bulb without substitution or adaptation.