Yamaha YZF-R125 Service Manual: Checking the shift forks
The following procedure applies to all of the shift forks.
1. Check:
- Shift fork cam follower "1"
- Shift fork pawl "2"
Bends/damage/scoring/wear
Replace the shift fork.
2. Check:
- Shift fork guide bar
Roll the shift fork guide bar on a flat surface.
Bends
Replace.
| WARNING Do not attempt to straighten a bent shift fork guide bar. |
3. Check:
Shift fork movement
(along the shift fork guide bar)
Rough movement Replace the shift
forks
and shift fork guide bar as a set.
Transmission
...
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" ...
Other materials:
Installing the valves
The following procedure applies to all of the
valves and related components.
1. Deburr:
Valve stem end
(with an oil stone)
2. Lubricate:
Valve stem "1"
Valve stem seal "2"
(with the recommended lubricant)
3. Install:
Lower spring seat "1"
Valve stem seal "2"
V ...
Checking the ignition coil
1. Check:
Primary coil resistance
Out of specification Replace.
a. Disconnect the ignition coil connectors from
the ignition coil terminals.
b. Connect the pocket tester ( × 1)
to the ignition
coil as shown.
Positive tester probe
red/white "1"
Negative tester probe
orange ...
Replacing the air filter element and cleaning the check hose
The air filter element should be replaced
at the intervals specified in the
periodic maintenance and lubrication
chart. Have a Yamaha dealer replace
the air filter element more frequently if
you are riding in unusually wet or dusty
areas. In addition, the air filter check
hose must be ...