Yamaha YZF-R125 Service Manual: Replacing the headlight bulbs
The following procedure applies to the low beam headlight bulb.
1. Remove:
- Headlight bulb cover "1"
2. Remove:
- Headlight bulb holder "1"
3. Remove:
- Headlight bulb "1"
| WARNING Since the headlight bulb gets extremely hot, keep flammable products and your hands away from the bulb until it has cooled down. |
4. Install:
- Headlight bulb
Secure the new headlight bulb with the headlight bulb holder.
| CAUTION: Avoid touching the glass part of the headlight bulb to keep it free from oil, otherwise the transparency of the glass, the life of the bulb and the luminous flux will be adversely affected. If the headlight bulb gets soiled, thoroughly clean it with a cloth moistened with alcohol or lacquer thinner. |
5. Install:
- Headlight bulb holder
6. Install:
- Headlight bulb cover
The following procedure applies to the high beam headlight bulb.
1. Remove:
- Headlight bulb cover "1"
2. Disconnect:
- Headlight coupler "1"
3. Remove:
- Headlight bulb holder "1"
4. Remove:
- Headlight bulb "1"
| WARNING Since the headlight bulb gets extremely hot, keep flammable products and your hands away from the bulb until it has cooled down. |
5. Install:
Headlight bulb 
Secure the new headlight bulb with the headlight
bulb holder.
| CAUTION: Avoid touching the glass part of the headlight bulb to keep it free from oil, otherwise the transparency of the glass, the life of the bulb and the luminous flux will be adversely affected. If the headlight bulb gets soiled, thoroughly clean it with a cloth moistened with alcohol or lacquer thinner. |
6. Install:
- Headlight bulb holder
7. Connect:
- Headlight coupler
8. Install:
- Headlight bulb cover
Electrical system
Checking and charging the battery
Refer to "ELECTRICAL COMPONENTS" on
page 8-57.
Checking the fuses
Refer to "ELECTRICAL COMPONENTS" on
page 8-57. ...
Adjusting the headlight beams
The following procedure applies to both of the
headlights.
1. Adjust:
Headlight beam (vertically)
a. Turn the adjusting screw "1" in direction "a" or
"b".
A. Left headlight
B. Right he ...
Other materials:
Outline of the fi system
The main function of a fuel supply system is to provide fuel to the
combustion chamber at the optimum
air-fuel ratio in accordance with the engine operating conditions and the
atmospheric temperature. In
the conventional carburetor system, the air-fuel ratio of the mixture that is
supplied t ...
Checking the crankshaft
1. Measure:
Crankshaft runout
Out of specification Replace
the crankshaft,
bearing or both.
NOTE:
Turn the crankshaft slowly.
2. Measure:
Big end side clearance
Out of specification Replace
the crankshaft.
3. Measure:
Crankshaft width
Out of specification&nbs ...
Protective apparel
The majority of fatalities from motorcycle
accidents are the result of head injuries.
The use of a safety helmet is the
single most critical factor in the prevention
or reduction of head injuries.
Always wear an approved helmet.
Wear a face shield or goggles.
Wind in your unprotecte ...