Yamaha YZF-R125 Service Manual: Installing the steering head
1. Lubricate:
- Upper bearing
- Lower bearing
- Bearing races
2. Install:
- Lower ring nut
- Rubber washer
- Upper ring nut
- Lock washer Refer to "CHECKING AND ADJUSTING THE STEERING HEAD" on page 3-22.
3. Install:
- Upper bracket
- Steering stem nut
NOTE:
Temporarily tighten the steering stem nut.
4. Install:
- Front fork legs Refer to "FRONT FORK" on page 4-44.
NOTE:
Temporarily tighten the upper and lower bracket pinch bolts.
5. Tighten:
- Steering stem nut
Checking the steering head
1. Wash:
Bearings
Bearing races
2. Check:
Bearings
Bearing races
Damage/pitting →Replace.
3. Replace:
Bearings
Bearing races
a. Remove the bearing races from the ste ...
Other materials:
Checking the piston pin
1. Check:
Piston pin
Blue discoloration/grooves
Replace the
piston pin and then check the lubrication system.
2. Measure:
Piston pin outside diameter "a"
Out of specification Replace
the piston pin.
3. Measure:
Piston pin bore diameter "b"
Out of specifica ...
Checking the turn signal relay
1. Check:
Turn signal relay input voltage
Out of specification →The wiring circuit
from
the main switch to the turn signal relay coupler
is faulty and must be repaired.
a. Connect the pocket tester (DC 20 V) to the
turn signal relay terminal as shown.
- Positive tester probe
b ...
Checking the camshaft sprocket and timing chain guide
1. Check:
Camshaft sprocket
More than 1/4 tooth wear "a" Replace
the
camshaft sprocket, timing chain and crankshaft
as a set.
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
2. Check:
Timing chain guide (exhaust side)
Damage/wear Replace.
...