Yamaha YZF-R125 Service Manual: Checking the drive sprocket
1. Check:
- Drive sprocket
More than 1/4 tooth "a" wear
Replace the drive chain sprockets as a set.Bent teeth
Replace the drive
chain sprockets as a set.
b. Correct
1. Drive chain roller
2. Drive chain sprocket
Checking the rear wheel sprocket
Refer to "CHECKING AND REPLACING THE REAR WHEEL SPROCKET" on page 4-15.
Checking the rear wheel drive hub
Refer to "CHECKING THE REAR WHEEL DRIVE HUB" on page 4-15.
Checking the drive chain
1. Measure:
15-link section "a" of the drive chain
Out of specification Replace the drive
chain.
a. Measure the length "a" between the inner
sides of the pins and the length "b" between
t ...
Installing the drive chain
1. Lubricate:
Drive chain
Master link
2. Install:
Drive sprocket
Drive sprocket retainer bolts
3. Install:
Master link
O-rings
Master link plate
Master link clip "1"
...
Other materials:
Checking the spark plug
The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked
in accordance with the periodic maintenance
and lubrication chart. In addition,
the condition of the ...
Checking the clutch springs
The following procedure applies to all of the
clutch springs.
1. Check:
Clutch spring
Damage Replace the clutch
springs as a
set.
2. Measure:
Clutch spring free length "a"
Out of specification Replace
the clutch
springs as a set.
...
Checking the starter motor
1. Check:
Commutator
Dirt Clean with 600 grit
sandpaper.
2. Measure:
Commutator diameter "a"
Out of specification Replace
the starter
motor.
3. Measure:
Mica undercut "a"
Out of specification Scrape
the mica to the
proper measurement with a hacksaw blade
...