Yamaha YZF-R125 Service Manual: Adjusting the rear disc brake
1. Check:
- Brake pedal position
(distance "a" from the center of the rider footrest
to the center of the brake pedal)
Out of specification
Adjust.
2. Adjust:
- Brake pedal position
a. Loosen the locknut "1".
b. Remove the cotter pin "2", washer "3", and pin "4".
c. Turn the adjusting nut "5" in direction "a" or "b"
until the specified brake pedal position is obtained.
d. Tighten the locknut "1" to specification.
| WARNING A soft or spongy feeling in the brake pedal can indicate the presence of air in the brake system. Before the vehicle is operated, the air must be removed by bleeding the brake system. Air in the brake system will considerably reduce braking performance. |
| CAUTION: After adjusting the brake pedal position, make sure there is no brake drag. |
e. Install the pin, washer, and cotter pin.
| WARNING Always use a new cotter pin. |
Chassis
...
Checking the brake fluid level
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
Make sure the vehicle is upright.
2. Check:
Brake fluid level
Below the minimum level mark "a" → ...
Other materials:
Installing the cylinder head
1. Install:
Cylinder head
NOTE:
Pass the timing chain through the timing chain
cavity.
2. Tighten:
Cylinder head bolts "1"
Cylinder head bolts "2"
NOTE:
Lubricate the cylinder head bolts and washers
with engine oil.
Tighten the cylinder head bolts in the proper
tighten ...
Removing the primary drive gear and balancer gears
1. Loosen:
Primary drive gear nut "1"
NOTE:
Place the aluminum plate "a" between the balancer
drive gear "2" and the balancer driven
gear "3", and then loosen the primary drive gear
nut.
2. Straighten the lock washer tab.
3. Loosen:
Balancer driven gear nut "1"
NOTE:
Place ...
Tires
To maximize the performance, durability,
and safe operation of your motorcycle,
note the following points regarding
the specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
Operation of this vehicle with impro ...