Yamaha YZF-R125 Service Manual: Checking the transmission
1. Measure:
- Main axle runout
(with a centering device and dial gauge "1")
Out of specification
Replace
the main axle.
2. Measure:
- Drive axle runout
(with a centering device and dial gauge "1")
Out of specification
Replace
the drive axle.
3. Check:
- Transmission gears
Blue discoloration/pitting/wear
Replace the defective gear(s). - Transmission gear dogs
Cracks/damage/rounded edges
Replace the defective gear(s).
4. Check:
- Transmission gear engagement
(each pinion gear to its respective wheel
gear)
Incorrect
Reassemble the
transmission axle assemblies.
5. Check:
- Transmission gear movement
Rough movement
Replace the
defective part(s).
Checking the shift drum assembly
1. Check:
Shift drum groove
Damage/scratches/wear Replace
the shift
drum assembly.
Shift drum segment "1"
Damage/wear Replace the
shift drum assembly.
Shift drum bearing "2" ...
Checking the clutch push rods
1. Check:
Long clutch push rod
Cracks/damage/wear Replace the
long
clutch push rod.
2. Measure:
Push rod bending limit
Out of specification Replace
the long
clutch push rod. ...
Other materials:
Installing the relay arm
1. Lubricate:
Spacers
Bearings
Oil seals
Bolts (unthreaded shaft portion only)
2. Install:
Bearing "1"
(to the relay arm)
Oil seal "2"
(to the relay arm)
3. Rear shock absorber assembly
4. Relay arm
5. Connecting arm
A. Left side
B. Right side ...
Shifting
Shifting
Shift pedal
Neutral position
Shifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing hills,
etc.
The gear positions are shown in the illustration.
TIP
To shift the transmission into the neutral
position, press the ...
Adjusting the clutch lever free play
Adjusting the clutch lever free play
Clutch lever free play adjusting bolt
Clutch lever free play
The clutch lever free play should measure
10.0-15.0 mm (0.39-0.59 in) as
shown. Periodically check the clutch lever
free play and, if necessary, adjust it
as follows.
Slide the ...