Yamaha YZF-R125 Service Manual: Checking and adjusting the steering head
1. Stand the vehicle on a level surface
| WARNING Securely support the vehicle so that there is no danger of it falling over. |
NOTE:
Place the vehicle on a suitable stand so that the front wheel is elevated.
2. Check:
- Steering head
Grasp the bottom of the front fork legs and
gently rock the front fork.
Binding/looseness → Adjust the steering head.
3. Remove:
- Upper bracket Refer to "STEERING HEAD" on page 4-52.
4. Adjust:
- Steering head
a. Remove the lock washer "1", the upper ring nut "2", and the rubber washer "3".
b. Tighten the lower ring nut "4" with a steering nut wrench "5".
NOTE:
Set the torque wrench at a right angle to the steering nut wrench.
c. Loosen the lower ring nut "4" completely, and then tighten it to specification with a steering nut wrench.
| WARNING Do not overtighten the lower ring nut. |
d. Check the steering head for looseness or binding by turning the front fork all the way in both directions. If any binding is felt, remove the lower bracket and check the upper and lower bearings.
Refer to "STEERING HEAD" on page 4-52.
e. Install the rubber washer "3".
f. Install the upper ring nut "2".
g. Finger tighten the upper ring nut "2", and then align the slots of both ring nuts. If necessary, hold the lower ring nut and tighten the upper ring nut until their slots are aligned.
NOTE:
Make sure the lock washer tabs "a" sit correctly in the ring nut slots "b".
5. Install:
- Upper bracket Refer to "STEERING HEAD" on page 4-52.
Lubricating the drive chain
The drive chain consists of many interacting
parts. If the drive chain is not maintained properly,
it will wear out quickly. Therefore, the drive
chain should be serviced, especially when the
vehi ...
Checking the front fork
1. Stand the vehicle on a level surface.
WARNINGSecurely support the vehicle so that there
is
no danger of it falling over.
2. Check:
Inner tube
Damage/scratches Replace.
...
Other materials:
Faulty lighting or signaling system
Headlight does not come on
- Wrong headlight bulb
- Too many electrical accessories
- Hard charging
- Incorrect connection
- Improperly grounded circuit
- Poor contacts (main or light switch)
- Burnt-out headlight bulb
Headlight bulb burnt out
- Wrong headlight bulb
- Faulty battery
- Fau ...
Installing the rear wheel (disc)
1. Install:
Rear brake disc
NOTE:
Tighten the brake disc bolts in stages and in a
crisscross pattern.
2. Check:
Rear brake disc
Refer to "CHECKING THE REAR BRAKE
DISC" on page 4-33.
3. Lubricate:
Rear wheel axle
Contact surface of rear wheel hub and rear
wheel
Whee ...
Introduction
WARNINGDisc brake components rarely require
disassembly.
Therefore, always follow these preventive
measures:
Never disassemble brake components unless
absolutely necessary.
If any connection on the hydraulic brake
system is disconnected, the entire brake
sy ...