Yamaha YZF-R125 Service Manual: Checking the front brake disc
1. Remove:
- Front wheel Refer to "FRONT WHEEL" on page 4-6.
2. Check:
- Brake disc
Damage/galling
Replace.
3. Measure:
- Brake disc deflection
Out of specification
Correct the
brake disc deflection or replace the brake disc.
a. Place the vehicle on a suitable stand so that the front wheel is elevated.
b. Before measuring the front brake disc deflection, turn the handlebar to the left or right to ensure that the front wheel is stationary.
c. Remove the brake caliper.
d. Hold the dial gauge at a right angle against the brake disc surface.
e. Measure the deflection 1.5 mm (0.06 in) below the edge of the brake disc.
4. Measure:
- Brake disc thickness
Measure the brake disc thickness at a few different
locations.
Out of specification
Replace.
5. Adjust:
- Brake disc deflection
a. Remove the brake disc.
b. Rotate the brake disc by one bolt hole.
c. Install the brake disc.
NOTE:
Tighten the brake disc bolts in stages and in a crisscross pattern.
d. Measure the brake disc deflection.
e. If out of specification, repeat the adjustment steps until the brake disc deflection is within specification.
f. If the brake disc deflection cannot be brought within specification, replace the brake disc.
6. Install:
- Front wheel Refer to "FRONT WHEEL" on page 4-6.
Introduction
WARNINGDisc brake components rarely require
disassembly.
Therefore, always follow these preventive
measures:
Never disassemble brake components unless
absolutely necessa ...
Replacing the front brake pads
NOTE:
When replacing the brake pads, it is not necessary
to disconnect the brake hose or disassemble
the brake caliper.
1. Measure:
Brake pad wear limit "a"
Out of specification Replace
...
Other materials:
Adjusting the engine idling speed
The engine idling speed must be
checked and, if necessary, adjusted as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
The engine should be warm before
making this adjustment.
Remove panel A.
Check the engine idling speed
and, if necessary, ...
Safe Riding
Perform the pre-operation checks each
time you use the vehicle to make sure it
is in safe operating condition. Failure to
inspect or maintain the vehicle properly
increases the possibility of an accident
or equipment damage. See page 4-1
for a list of pre-operation checks.
This motor ...
Incorrect engine idling speed
Engine
1. Cylinder and cylinder head
Incorrect valve clearance
Damaged valve train components
2. Air filter
Clogged air filter element
Fuel system
1. Throttle body
Damaged or loose throttle body joint
Improperly adjusted engine idling speed (idle
adjusting screw)
Improper ...