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:
Checking the cylinder head breather hose
1. Remove:
Left side panel
Refer to "GENERAL CHASSIS" on page 4-1.
2. Check:
Cylinder head breather hose "1"
Cracks/damage → Replace.
Loose connection → Connect properly.
CAUTION:Make sure the cylinder head
breather hose is
routed correctly.
...
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 cylinder and piston
1. Check:
Piston wall
Cylinder wall
Vertical scratches Replace the
cylinder,
and replace the piston and piston rings as a
set.
2. Measure:
Piston-to-cylinder clearance
a. Measure cylinder bore "C" with the cylinder
bore gauge.
NOTE:
Measure cylinder bore "C" by takin ...