Honda Motorcycle CB600F 599 front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure 1073 or P21W in size. The replacement chart covers 2004 to 2007 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 front turn signal position on the Honda Motorcycle CB600F 599 uses the 1034 bulb across the 2004-2007 model years.
The 1034 is an ANSI-standard bulb rated at 12V and 21/5W, featuring a dual-filament design on a BAY15d bayonet base, and is classified as a variant of the 1157.
A dual-filament bulb like the 1034 supports two brightness levels from a single housing, which is why it carries two wattage values, 21W and 5W, corresponding to its two filaments.
The rear turn signal position on the CB600F 599 uses different bulbs depending on the model year, with the 2007 fitted with the 1073 and the 2004-2006 fitted with the P21W.
The 1073 and P21W share the same BA15s bayonet base, meaning both are physically single-filament bulbs with the same base type, though they originate from different standards bodies.
The 1073 follows the ANSI standard applicable in the US and Canada, while the P21W follows the ECE standard used in Europe and worldwide markets.
Despite sharing the same BA15s base, the 1073 is rated at 13W while the P21W is rated at 21W, representing a notable difference in power draw between the two rear turn signal bulbs used across model years.
The 1073 is described as a lower wattage variant of the 1156, which is itself a common single-filament BA15s bulb, placing the 1073 within a well-established family of automotive signalling bulbs.
The front and rear turn signal positions on the CB600F 599 use bulbs with different base types, the BAY15d on the front and the BA15s on the rear, making the two positions non-interchangeable.
The BAY15d base used by the 1034 includes an offset pin arrangement that prevents single-filament BA15s bulbs from being seated in its socket, serving as a physical safeguard against incorrect fitment.