The KTM 640 Duke II uses a 9005 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 1999 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The KTM 640 Duke II uses the 9005 bulb for both high beam and low beam headlight positions across the full 1999-2006 model range.
The 9005 is a single-filament halogen bulb, meaning it serves only one lighting function per socket. Its use in both headlight positions on this motorcycle requires two separate bulbs rather than one dual-filament unit.
The 9005 operates at 12 volts and 65 watts, which is a standard output level for halogen headlight bulbs in this class of application.
The 9005 uses a P20d base, a push-and-twist locking mount that secures the bulb mechanically without a separate retaining clip.
The 9005 is an ANSI-standardized bulb type recognized in the United States and Canada, meaning replacement units from multiple manufacturers are expected to conform to the same electrical and physical specifications.
Because the high beam and low beam positions share the same bulb type on the 640 Duke II, a single replacement part number covers both sockets, though each position requires its own individual bulb.