The Yamaha XV1700 Road Star front turn signal uses a 1034NA bulb size, while the rear turn signal requires either a 12496 or PY21W bulb size. The replacement chart covers 2004 through 2009 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 1034NA bulb is an ANSI-standard type used in the United States and Canada. It features a dual-filament design with a BAY15d bayonet base and natural amber glass, rated at 12V and 21/5W. It is a variant of the widely used 1157 bulb.
The Yamaha XV1700 Road Star uses the 1034NA bulb for the front turn signal across all model years covered in the specifications, spanning 2004-2009.
The BAY15d base on the 1034NA is a dual-contact bayonet fitting. Its two filaments operate at different wattages, with the higher-output filament typically serving the turn signal function and the lower-output filament serving a secondary role.
The rear turn signal position uses two different bulb types depending on the model year, meaning rear bulbs are not uniform across the 2004-2009 production run.
The PY21W is an ECE-standard single-filament amber bulb with a BAU15s bayonet base, rated at 12V and 21W. The BAU15s base uses an offset pin arrangement that physically prevents substitution with BAY15d-based bulbs such as the 1034NA.
The Yamaha XV1700 Road Star uses the PY21W for the rear turn signal in model years 2004-2006 and 2008.
The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty applications. It is specified for the rear turn signal in model years 2007 and 2009.
The rear turn signal specification alternates between the PY21W and 12496 across certain model years, which indicates the two bulbs are not freely interchangeable without confirming the socket type for the specific year in question.
The BAU15s base of the PY21W differs from the BAY15d base of the 1034NA in pin offset angle, making cross-substitution between front and rear bulbs physically incompatible on this motorcycle.
Because the front position consistently uses the 1034NA across all listed years while the rear position varies, the front and rear turn signal bulbs on the XV1700 Road Star are not the same type and cannot be used interchangeably.