Yamaha YZF-R125 Service Manual: Checking the condition of the bulbs

Yamaha YZF-R125 Service Manual / Electrical system / Electrical components / Checking the bulbs and bulb sockets / Checking the condition of the bulbs

The following procedure applies to all of the bulbs.

1. Remove:

Bulb

WARNING

Since the headlight bulbs get extremely hot, keep flammable products and your hands away from them until they have cooled down.

CAUTION:

Be sure to hold the socket firmly when removing the bulb. Never pull the lead, otherwise it may be pulled out of the terminal in the coupler.
Avoid touching the glass part of a 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.

2. Check:

Bulb (for continuity) (with the pocket tester) No continuity Replace.

NOTE:

Before checking for continuity, set the pocket tester to "0" and to the " × 1" range.

a. Connect the positive tester probe to terminal "1" and the negative tester probe to terminal "2", and check the continuity.

b. Connect the positive tester probe to terminal "1" and the negative tester probe to terminal "3", and check the continuity.

c. If either of the readings indicate no continuity, replace the bulb.

Types of bulbs

The bulbs used on this vehicle are shown in the illustration. Bulbs "a" and "b" are used for the headlights and usually use a bulb holder that must be detached before removing the bulb. The m ...

Checking the condition of the bulb sockets

The following procedure applies to all of the bulb sockets. 1. Check: Bulb socket (for continuity) (with the pocket tester) No continuity Replace. NOTE: Check each bulb socket for continui ...

Other materials:

Checking the thermostat
1. Check: Thermostat Does not open at 80.5-83.5 C (176.9-182.3 F) Replace. a. Suspend the thermostat "1" in a container "2" filled with water. b. Slowly heat the water "3". c. Place a thermometer "4" in the water. d. While stirring the water, observe the thermostat and th ...

Cable routing
Front brake light switch lead Right handlebar switch lead Throttle cable Main switch Clutch cable Clutch switch lead Left handlebar switch lead Sub-wire harness Horn Speed sensor lead Front brake hose Main switch lead Left headlight assembly lead Right headlight asse ...

Installing the shift shaft
1. Install: Stopper lever "1" Stopper lever spring "2" NOTE: Install the stopper lever spring as shown in the illustration. Hook the ends of the stopper lever spring onto the stopper lever and the crankcase boss "3". Mesh the stopper lever with the shift drum segment assembly. ...