Light Unit & Light Bulb

The headlights, taillights, turn signal lights, and other vehicle lights are important parts for ensuring the operational safety of the motorcycle.
Genuine light units and light bulbs feature brightness that has passed national standards, with construction and performance that are optimal for motorcycles.

The Feature of Parts

  • Genuine Light Units with High Quality and Durability that Maintain Brightness
  • Brightness for Enhanced Field of Vision and Safety to Make the Vehicle Visible
  • Balance Between Brightness, Service Life, and Energy Savings


Daily Inspection

The operating life of the light bulb can be difficult to determine by the travel distance or period, so check that the light bulb operates before riding. When replacing the light bulb, use a light bulb with the specified wattage and standards.

Inspecting and Replacing the Headlight

Inspect the lens for dirt or damage, and then start the engine and check that the high and low beams work. If the high and low beams do not work, check the fuse. If the bulb is burned out or the fuse is blown, replace with a new one, and have your Yamaha dealer perform an inspection and maintenance, as the cause may be in other electrical systems or the headlight unit.

Inspecting and Replacing the Turn Signal Light Bulb

Inspect the lens for dirt or damage, and then turn on the main switch and check that the turn signal light flashes. If one turn signal light is burned out, the other turn signal light may not flash or may flash faster. Replace the burned out turn signal light bulb with a new one.
Have your Yamaha dealer perform an inspection, as the cause may be in the electrical system, such as the turn signal light relay.

Inspecting and Replacing the Taillight

Inspect the lens for dirt or damage, and then turn on the main switch and check that the taillight and brake light turn on. If the license plate light and taillight unit are separate, check that the license plate light also turns on. If the brake light does not turn on, check the brake light switch and light bulb. If the bulb is the source of the problem, replace the bulb. If the brake light switch is the source of the problem, have your Yamaha dealer inspect and fix it.

Table of Items to Regularly Inspect

Refer to the applicable service manual for the inspection and maintenance procedures.

General Periodic Maintenance
Lights, signals and switches Check operation.
Adjust headlight beam.
*Since these items require special tools, data and technical skills, have a Yamaha dealer perform the service.

Problems and Counter-measures

When the Wattage of the Light Bulb Does Not Match the Light

  • Headlight
  • The light bulb burns out more frequently.
  • Turn signal light
  • The flashing of the turn signal light can increase or decrease. The light bulb can burn out faster.
  • Taillight
  • The light bulb burns out more frequently.

When using a light bulb (even a genuine light bulb) that is for a different vehicle that does not match the wattage of the light, the light bulb may not turn on or flash correctly.

When the Battery Is Low

When the battery power becomes low, the internal resistance increases. As resistance increases, it becomes difficult for electricity to pass through, and the large amount of electricity generated by the alternator flows to the headlight and other electrical circuitry, with the current that is not consumed creating a load, thereby burning out the bulb.
If the brightness of the light changes significantly depending on the throttle position, the battery voltage may have decreased. The battery must be charged or replaced.

Fogging on the Inner Side of the Light Unit

Genuine light units have passed rigorous airtightness inspections. However, the light units have a breathing hole, from which air with high humidity may enter the unit. The air with high humidity may condense into water vapor and stick onto the inner side of the light lens. This fogging disappears once the water vapor evaporates.
If the light unit is damaged and large amount of moisture enters the unit, the condensation and moisture on the inner side of the lens may rapidly cool the light bulb, causing it to shatter.

Frequently Asked Questions

[ Questions About Performance ]

Q1: Do genuine headlights come in HID models?

A1: High Intensity Discharge (HID) units require not only an HID bulb but also the lighting circuitry, and the required mounting space and increased weight are not viable for a motorcycle; therefore, HID units are not used for genuine headlights, as in automobiles. Halogen bulbs provide sufficient brightness and are compact and lightweight, so they are the main type of motorcycle headlight.

Q2: Will mounting a non-genuine LED bulb to an incandescent taillight unit make it lighter?

A2: Replacing only the bulb will not change the weight much. LED taillights are lightweight because of the special design of the LED bulb. Also, mounting an LED bulb in an incandescent bulb structure will not necessarily provide the light distribution of an LED taillight.
Use the specified light bulb.

[ Questions About Maintenance ]

Q3: If one bulb on a two-bulb headlight burns out, do both bulbs have to be replaced?

A3: This varies depending on the construction of the light unit.
If two light units are installed, with each unit having Hi and Lo lights, and if the light bulbs have the same specifications, the life of the bulbs are not significantly different, therefore it is preferable that the other light bulb be replaced at the same time, even if it is still working.
If the dual headlight consists of a Hi-only unit and a Lo-only unit, as in a projector lamp, here is no problem with replacing just the bulb that burned out.

Q4: Does the optical axis have to be adjusted when replacing the headlight bulb?

A4: Strictly speaking, the optical axis has to be adjusted.
The light bulb itself has a tolerance, so if a light bulb of a different lot is installed, the optical axis also changes.