Yamaha YZF-R125 Service Manual: Checking the starter clutch
1. Check:
- Starter clutch rollers "1"
- Starter clutch spring caps "2"
- Starter clutch springs "3"
Damage/wear 
Replace the starter
clutch
assembly.
2. Check:
- Starter clutch idle gear
- Starter clutch gear Burrs/chips/roughness/wear Replace the defective part(s).
3. Check:
- Starter clutch gear contacting surfaces Damage/pitting/wear Replace the starter clutch gear.
4. Check:
- Starter clutch operation
a. Install the starter clutch gear "1" onto the starter clutch and hold the generator rotor.
b. When turning the starter clutch gear clockwise "A", the starter clutch and the starter clutch gear should engage, otherwise the starter clutch is faulty and must be replaced.
c. When turning the starter clutch gear counterclockwise
"B", it should turn freely, otherwise
the starter clutch is faulty and must be replaced.
Removing the starter clutch
1. Remove:
Starter clutch bolts "1"
NOTE:
While holding the generator rotor "2" with the
sheave holder "3", remove the starter clutch
bolts.
Do not allow the sheave holder to touch th ...
Installing the starter clutch
1. Install:
Starter clutch assembly
Starter clutch bolts "1"
NOTE:
While holding the generator rotor "2" with the
sheave holder "3", tighten the starter clutch
bolts.
Do not allow t ...
Other materials:
Installing the clutch
1. Install:
Conical spring washer "1"
NOTE:
Install the conical spring washer as shown in the
illustration.
2. Install:
Clutch housing
Thrust washer "1"
NOTE:
Be sure to install the thrust washer so that its
sharp edge "a" is facing away from the clutch
boss.
3. Instal ...
Assembling the front wheel
1. Install:
Wheel bearings
Oil seal
a. Install the new wheel bearings and oil seal in
the reverse order of disassembly.
CAUTION:Do not contact the wheel bearing inner
race
"1" or balls "2". Contact should be made
only with the outer race "3".
NOTE:
Use a socket " ...
Changing the coolant
1. Remove:
Lower side cowlings
Refer to "GENERAL CHASSIS" on page 4-1.
2. Remove:
Radiator cap "1"
WARNINGA hot radiator is under pressure.
Therefore,
do not remove the radiator cap when the engine
is hot. Scalding hot fluid and steam may
be blown out, which c ...