Honda Motorcycle CB750F Super Sport Turn Signal Bulb Size
Honda Motorcycle CB750F Super Sport front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure P21W or 1073, with these bulb specifications applying to the vehicle's production range. The replacement chart covers 1981 to 1982 model years and contains bulb size data corresponding to each production year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CB750F Super Sport uses three distinct bulb types across its front and rear turn signals for the 1981-1982 model years: the 1034, the P21W, and the 1073.
The 1034 is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base. It is classified as a variant of the more widely known 1157 bulb.
The BAY15d base used by the 1034 is an offset dual-contact bayonet fitting, which physically prevents single-filament bulbs from being inserted in its place. This makes the 1034 non-interchangeable with single-filament bulbs that share a visually similar base style.
The 1034 is the specified front turn signal bulb for the CB750F Super Sport in both 1981 and 1982, making it the only bulb type that remains consistent across both years and both model years at the front position.
The P21W follows the ECE standard, which is the regulatory framework used in Europe and much of the world outside North America. It is a single-filament bulb rated at 12V and 21W, using a BA15s bayonet base.
The 1073 is an ANSI-standard single-filament bulb rated at 12V and 13W, also using a BA15s bayonet base. It is described as a lower wattage variant of the 1156 bulb.
Although the P21W and the 1073 both use a BA15s bayonet base, their wattage ratings differ significantly, at 21W and 13W respectively. Substituting one for the other would result in a mismatch with the original electrical load specification for that position.
The rear turn signal position on the Honda Motorcycle CB750F Super Sport changed bulb type between model years, with the 1073 specified for 1981 and the P21W specified for 1982. These two bulbs draw different amounts of current despite sharing the same base type.
The 1034 is designated as an ANSI standard, meaning its specifications are defined for the US and Canadian markets. The P21W, by contrast, is governed by ECE standards, reflecting a different regional regulatory origin.
Because the 1034 is a dual-filament bulb and the P21W and 1073 are both single-filament bulbs, the front and rear turn signal sockets on this motorcycle are not electrically equivalent, and bulbs from one position are not suitable replacements for the other.