Honda Motorcycle CH250 Elite Turn Signal Bulb Size
Honda Motorcycle CH250 Elite front turn signal bulbs measure P21/5W or 1034 in size, while rear turn signal bulbs measure P21W or 1073 in size. The replacement chart covers 1985 through 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 CH250 Elite uses two distinct front turn signal bulb types across its production years: the 1034 (1985-1988) and the P21/5W (1989-1990).
Both the 1034 and P21/5W are dual-filament bulbs rated at 12V with a 21W/5W output, and both use a BAY15d bayonet base, with the 1034 following the ANSI standard and the P21/5W following the ECE standard.
The shared BAY15d base between the 1034 and P21/5W means the two bulbs are physically similar in mounting, though they originate from different regional standardization systems.
The 1034 is a variant of the widely known 1157 bulb, placing it within a common ANSI family used across North American automotive and motorcycle applications.
The rear turn signal of the CH250 Elite uses the P21W for 1987-1990 and the 1073 for 1985-1986, representing a change in both bulb type and filament configuration across the production run.
The P21W is a single-filament ECE-standard bulb rated at 12V and 21W, using a BA15s bayonet base, which is a smaller and non-interchangeable base compared to the BAY15d used in the front turn signal bulbs.
The 1073 is a single-filament ANSI-standard bulb rated at 12V and 13W, also using a BA15s base, and is classified as a lower-wattage variant of the 1156.
Despite sharing the same BA15s base, the 1073 and P21W differ in wattage (13W versus 21W), which means substituting one for the other would alter the light output of the rear turn signal.
The front and rear turn signal positions use incompatible base types across all model years, as the front uses BAY15d and the rear uses BA15s, making cross-position substitution physically impossible.
The dual-filament design of the front turn signal bulbs (both 1034 and P21/5W) contrasts with the single-filament rear bulbs, indicating the front position serves a combined function while the rear is dedicated solely to signalling.