Honda Motorcycle CN250 Helix Turn Signal Bulb Size
Honda Motorcycle CN250 Helix front turn signal bulbs measure 1034 size, while rear turn signal bulbs measure 1073 and P21W size. The replacement chart covers 1986 to 2007 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 CN250 Helix uses the 1034 bulb across all listed model years for the front turn signal position, spanning 1986-2007, with no variation in that position throughout the entire production range covered by these specifications.
The 1034 is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base. Its dual-filament design means it is capable of serving both a brighter primary function and a dimmer secondary function within a single housing.
The 1034 is described as a variant of the 1157, which is one of the most widely used automotive bulb types in North American applications. This relationship indicates a degree of dimensional and electrical compatibility within that bulb family, though substitution should be confirmed against socket and circuit requirements.
The rear turn signal position on the Honda Motorcycle CN250 Helix alternates between two bulb types across model years: the 1073 and the P21W. Both share the BA15s single-filament bayonet base, meaning the socket interface is physically the same for both types.
Despite sharing the same BA15s base, the 1073 and P21W differ significantly in wattage. The 1073 is rated at 13W, while the P21W is rated at 21W. Substituting one for the other without accounting for this wattage difference could affect circuit load and turn signal flash rate.
The 1073 is an ANSI-standard bulb used primarily in North American markets, while the P21W follows the ECE standard used in European and worldwide markets. The presence of both types across different model years of the same vehicle suggests regional or production variation in the CN250 Helix's rear signal assembly.
The front turn signal circuit on the CN250 Helix is designed around a dual-filament bulb, whereas the rear uses a single-filament type. These two positions are therefore not interchangeable by bulb type, even though both operate at 12V.
For the rear turn signal, the 1073 is specified for the 1986-1987, 1992, 1994-1995, 1997, 2001, and 2006-2007 model years, while the P21W is specified for 1986, 1993, 1996, 1998-2000, 2004-2005 model years, reflecting that the two bulb types were used in alternating fashion across the production span.