Honda Motorcycle XL600R front and rear turn signal bulbs utilize P21W and 1073 bulb sizes respectively. The replacement chart covers 1983 to 1987 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 Honda Motorcycle XL600R uses two distinct bulb types across its turn signal positions: the P21W, an ECE-standard bulb common in European and worldwide markets, and the 1073, an ANSI-standard bulb used in the US and Canadian markets.
Both the P21W and the 1073 share a BA15s single-contact bayonet base, meaning the physical mounting interface is identical between the two bulb types.
Despite sharing the same base type, the P21W and 1073 are not electrically interchangeable. The P21W operates at 21W while the 1073 operates at 13W, a difference that affects turn signal flash rate and circuit load.
The 1073 is a lower-wattage variant of the 1156 bulb. While the 1156 is rated at 26.88W, the 1073 draws significantly less power at 13W, though both share the BA15s base format.
Both bulb types are single-filament designs, which is consistent with their dedicated turn signal function, as single-filament bulbs serve one lighting purpose rather than combining functions such as braking and signalling.
The front turn signal position on the Honda Motorcycle XL600R uses the P21W across all documented model years, spanning 1983-1987.
The rear turn signal position on the XL600R uses the P21W for the 1983-1984 model years and transitions to the 1073 for the 1985-1987 model years, making the rear position year-dependent when sourcing a replacement.
Because the rear turn signal bulb specification changed between the 1984 and 1985 model years, confirming the exact model year is necessary before selecting a rear turn signal bulb for the XL600R.