2003 YAMAHA TTR125 oil

5 - 56
CHASSWINGARM
EC578000
SWINGARM DISASSEMBLY
Extent of removal:1 Swingarm disassembly 2 Connecting arm removal and disassembly
3 Relay arm removal and disassembly
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1Drive chain guard 1
2Drive chain support 1
3Drive chain guide 1
4Dust cover 4
5Collar 1
6Connecting arm 1
7Oil seal 2
8Collar 2
9Dust cover 2
0Bushing 1
ARelay arm 1
BDust cover 2
CBushing 1
DSwingarm 1
3
1
2

5 - 57
CHASSWINGARM
REMOVAL POINTS
Bushing
1. Remove:
Bushing 1
NOTE:
Remove the bushing by pressing.
INSPECTION
Wash the bushings, collars, and covers in a
solvent.
Swingarm
1. Inspect:
Bushing 1
Bushing 2
Damage/pitting → Replace bushings as
a set.
2. Inspect:
Dust cover
Damage → Replace.
3. Inspect:
Swingarm
Damage/bends/cracks → Replace.
Relay arm
1. Inspect:
Collar 1
Bushing 2
Damage/pitting → Replace collar and
bushing as a set.
Bushing 3
Bushing 4
Damage/pitting → Replace bushings as
a set.
Collar 5
Bushing 6
Bushing 7
Damage/pitting → Replace collars and
bushing as a set.
2. Inspect:
Oil seal 8
Dust cover 9
Damage → Replace.
3. Inspect:
Relay arm 0
Damage/bends/cracks → Replace.

5 - 59
CHAS
2. Install:
Oil seals 1
Collars 2
Bushing 3
Dust covers 4
Dust covers 5
Rubber boot 6
On relay arm.
NOTE:
Apply the molybdenum disulfide grease on the
bushing, collar, oil seal lip and dust cover lip.
3. Install:
Collar 1
Dust covers 2
On connecting arm.
NOTE:
Apply the molybdenum disulfide grease on the
collar and dust cover lip.
4. Install:
Relay arm 1
Bolt (relay arm)
Plain washer
Nut (relay arm)
On swingarm.
NOTE:
Apply the molybdenum disulfide grease on the
bolt (relay arm).
5. Install:
Connecting arm 1
Bolt (connecting arm)
Plain washer
Nut (connecting arm)
On relay arm.
NOTE:
Apply the molybdenum disulfide grease on the
bolt (connecting arm).
T R..53 Nm (5.3 m · kg, 38 ft · lb)
T R..35 Nm (3.5 m · kg, 25 ft · lb)
SWINGARM

5 - 63
CHASREAR SHOCK ABSORBER ASSEMBLY
HANDLING NOTE
WARNING
This rear shock absorber contains high-
pressure nitrogen gas. To prevent the dan-
ger of explosion, read and understand the
following information before handling the
shock absorber.
The manufacturer can not be held responsi-
ble for property damage or personal injury
that may result from improper handling.
1. Never tamper or attempt to open the
rear shock absorber.
2. Never throw the rear shock absorber
into an open flame or other high heat.
The rear shock absorber may explode
as a result of nitrogen gas expansion
and/or damage to the hose.
3. Be careful not to damage any part of
the rear shock absorber. A damaged
rear shock absorber will impair the
damping performance or cause a mal-
function.
4. Take care not to scratch the contact
surface of the piston rod with the cyl-
inder; or oil could leak out.
5. When scrapping the rear shock
absorber, follow the instruction on
disposal.
NOTES ON DISPOSAL (YAMAHA DEALERS
ONLY)
Gas pressure must be released before dispos-
ing of a rear shock absorber and gas cylinder.
To release the gas pressure, drill a 2 ~ 3-mm
(0.08 ~ 0.12-in) hole through the gas cylinder
at a point 12 mm (0.5 in) a from its end as
shown.
WARNING
Wear eye protection to prevent eye damage
from released gas or metal chips.

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CHAS
EC583000
REMOVAL POINTS
Bushing
1. Remove:
Bushing 1
NOTE:
Remove the bushing by pressing.
EC584000
INSPECTION
Rear shock absorber assembly
1. Inspect:
Damper rod 1
Bends/damage → Replace rear shock
absorber assembly.
Shock absorber 2
Oil leaks → Replace rear shock
absorber assembly.
Gas leaks → Replace rear shock
absorber assembly.
Spring 3
Damage → Replace rear shock
absorber assembly.
Fatigue → Replace rear shock
absorber assembly.
Move spring up and down.
EC585000
ASSEMBLY AND INSTALLATION
Bushing
1. Install:
Bushing 1
NOTE:
Install the bushing by pressing.
REAR SHOCK ABSORBER ASSEMBLY

6 - 1
–+ELEC
* The illustration shows the TT-R125LW
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1CDI unit
2Engine stop switch
3Ignition coil
4CDI magneto
5Spark plugCOLOR CODE
B...................... Black
Br .................... Brown
G ..................... Green
O ..................... Orange
R ..................... Red
W..................... WhiteB/R .................. Black/Red
B/W ................. Black/White
G/L .................. Green/Blue
G/W ................. Green/White
W/L .................. White/Blue
W/R ................. White/Red
EC612000
WIRING DIAGRAM

–+ELEC
6 - 2
IGNITION SYSTEM
EC620000
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to
ignition system failure and for checking the spark plug which will not spark.
*marked: Only when the ignition checker is used.
NOTE:
Remove the following parts before inspection.
1) Seat
2) Fuel tank
Use the following special tools in this inspection.
Spark gap test*Clean or replace
spark plug.
Check entire ignition
system for connection.Repair or replace.
Check engine stop switch. Replace.
Check ignition coil. Primary coil Replace.
Secondary coil Replace.
Check CDI magneto. Pickup coil Replace.
Charging coil Replace.
Replace CDI unit.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754Pocket tester:
YU-3112-C/90890-03112
No Spark
OK
OK
OK
OK
Spark
No good
No good
No good
No good
No good
No good

6 - 4
–+ELECIGNITION SYSTEM
EC626002
IGNITION COIL INSPECTION
1. Inspect:
Primary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead 1
Tester (–) lead → Black lead 2
Primary coil
resistanceTester selector
position
0.18 ~ 0.28 Ω at
20 ˚C (68 ˚F)Ω × 1
2. Inspect:
Secondary coil resistance
Out of specification → Replace.
NOTE:
When inspecting the secondary coil resis-
tance, remove the spark plug cap.Tester (+) lead → Spark plug lead 1
Tester (–) lead → Orange lead 2
Secondary coil
resistanceTester selector
position
6.3 ~ 9.5 kΩ at
20 ˚C (68 ˚F)kΩ × 1