2005 YAMAHA TTR125 ignition

2 - 27
SPEC
EC240000
CABLE ROUTING DIAGRAM
TT-R125/TT-R125LW
1 CDI unit
2 CDI unit band
3 Clamp
4 CDI magneto lead
5 Air vent hose
6 Wire harness
7 Engine stop switch lead
8 Cable guide
9 Brake cable
(Brake hose for the TT-R125LW)
0 Brake cable holder
(Brake hose holder for the
TT-R125LW) Å
Fit the CDI unit band over the CDI unit bracket till it stops.
ı Clamp the ignition coil lead.
Ç Clamp the wire harness coupler.
Î Clamp the CDI magneto lead, throttle cable and starter cable.
‰ Clamp the CDI magneto lead so that it does not contact the push
lever.
Ï Pass the air vent hoses between the engine and swingarm.
Ì Clamp the wire harness and engine stop switch lead.
Ó Pass the brake cable (brake hose for the TT-R125LW) into the cable
guide.
È Clamp the brake cable.
Ô Clamp the brake hose between the paint marks.
CABLE ROUTING DIAGRAM

2 - 28
SPEC
1Air vent hose
2 Spark plug lead
3 Starter cable
4 Throttle cable
5 Clutch cable
6 Clamp
7 Cable guide
8 Engine oil breather hose
9 Overflow hose Å
After clamping the starter cable, push it against the starter plunger.
ı Put the tip of the air vent hose into the main pipe.
Ç Install the primary coil terminal (orange) to the ignition coil.
Î Fasten the ground lead together with the ignition coil.
‰ Pass the starter cable so that it is not twisted.
Ï Tighten the starter choke nut while taking care not to twist the starter\
cable.
Ì Pass the clutch cable on the inside of the throttle and starter cable.
Ó Clamp the clutch cable with the paint in the cable guide bottom recess.
È Pass the throttle cable and starter cable into the cable guide.
Ô Pass the engine oil breather hose and overflow hose between the right
half of the swingarm and pillar tube.
 Clamp the engine oil breather hose, overflow hose and air vent hose to 2\
clicks.
CABLE ROUTING DIAGRAM
0 Fuel tank breather hose
A Hose guide
Ó Pass the f
uel tank breather hose trought the hose guide

2 - 34
SPEC
‰Fasten the clutch cable with the
paint in the cable guide bottom
recess.
ÏPass the throttle cable and
starter cable through the cable
guide.
ÌFasten the starter motor lead.
ÓPass the engine oil breather
hose and overflow hose
between the right half of the
swingarm and frame.ÈPass the negative battery lead
on the inside of the frame as
shown.
ÔFasten the engine oil breather
hose, overflow hose and air
vent hoses to 2 clicks.
After fastening the starter cable,
push it against the starter
plunger.
ÒPut the tip of the air vent hose
into the frame.˜Install the primary coil terminal
(orange) to the ignition coil.
ˆFasten the ground lead together
with the ignition coil.
1
2
3
4
5
6
7
8
9
0
6 ABC6DEFGı
Î
‰
Ï
Ì Ó ÈÔÒ˜ˆ
Ç
Å
CABLE ROUTING DIAGRAM

3 - 3
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation or practice, make sure the machine is in good operating condi-
tion.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
FuelCheck that a fresh gasoline is filled in the fuel tank. Check the
fuel line for leakage.P.1-12
Engine oilCheck that the oil level is correct. Check the crankcase for leak-
age.P.3-7 ~ 10
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-4
Throttle grip/housingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-4 ~ 5
BrakesCheck the play of front and rear brake and effect of front and
rear brake.
Check fluid level and leakage. (TT-R125LW/TT-R125LWE only)P.3-15 ~ 20
Drive chainCheck chain slack and alignment. Check that the chain is lubri-
cated properly.P.3-21 ~ 22
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-27 ~ 28
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-28 ~ 32
Front forks and rear shock
absorber assemblyCheck that they operate smoothly and there is no oil leakage. P.3-23 ~ 26
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or
when the front forks travel up and down.—
Muffler Check that the muffler is tightly mounted and has no cracks. P.4-2
Sprocket Check that the driven sprocket tightening nut is not loose. P.3-20
Lubrication Check for smooth operation. Lubricate if necessary. P.3-33
Bolts and nuts Check the chassis and engine for loose bolts and nuts.—
Lead connectorsCheck that the CDI magneto, CDI unit, and ignition coil are con-
nected tightly.P.1-5

3 - 42
INSP
ADJ
3. Replace:
Blown fuse
WARNING
Never use a fuse with an amperage rating
other than that specified. Improvising or
using a fuse with the wrong amperage rat-
ing may cause extensive damage to the
electrical system, cause the starting and
ignition systems to malfunction and could
possibly cause a fire.
4. Install:
Battery cover Replacement steps:
Set the main switch to “OFF”.
Install a new fuse of the correct amperage.
Set on the switches to verify if the electri-
cal circuit is operational.
If the fuse immediately blows again, check
the electrical circuit.
ItemsAmperage
ratingQ’ty
Main fuse 10 A 1
FUSE INSPECTION (TT-R125E/TT-R125LWE)

–+ELEC
6 - 1
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
The illustration shows the TT-R125LW
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
TT-R125/TT-R125LW
EC611000
ELECTRICAL COMPONENTS
1CDI unit
2Engine stop switch
3Ignition coil
4CDI magneto
5Spark plugCOLOR CODE
B ................. Black
Br ................ Brown
G ................. Green
O ................. Orange
R ................. RedW ................ White
B/R.............. Black/Red
B/W ............. Black/White
G/L .............. Green/Blue
G/W ............ Green/WhiteW/L ............. White/Blue
W/R............. White/Red
EC612000
WIRING DIAGRAM

6 - 2
–+ELEC
The illustration shows the TT-R125LWE
12345 7 6890A
EDCB
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
TT-R125E/TT-R125LWE
EC611000
ELECTRICAL COMPONENTS
1CDI unit
2Main switch
3Start switch
4Clutch switch
5Engine stop switch
6Starting circuit cut-off
relay
7Ignition coil
8Battery
9Starter relay
0Fuse
ARectifier/regulator
BNeutral switch
CCDI magneto
DStarter motor
ESpark plugCOLOR CODE
B ...................... Black
Br ..................... Brown
G...................... Green
O...................... Orange
R ...................... Red
Sb .................... Sky blueW ..................... White
Y ...................... Yellow
B/W.................. Black/White
L/Y ................... Blue/Yellow
R/W ................. Red/White
EC612000
WIRING DIAGRAM
B
R/W
WB
RYW
BR Y
10A
R
BR/W
ON
OFFR
BrRB/WBB/WBr B
ON OFF
R/WBr BB
R/WSbR/W
BB BL/Y
OFF RUN
BBBB/W
W
YWSbBSbY B
G
WBrRG
WBrRB
B/WR
W Br
GO
R
SbR/WR/WR/WR/W
R/W
B
R
B/WBrBr
B
L/Y
BSb
YW
RWBrG
RWBrG
B/W
B/W
BOO
B
B
1
2
3
45 67
8
90 A
BC
DE

–+ELEC
6 - 3
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.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754Pocket tester:
YU-3112-C/90890-03112
Spark gap test*Clean or replace
spark plug.
Check entire ignition
system for connection.Repair or replace.
Check main switch.
(TT-R125E/TT-R125LWE
only)Replace.
Check engine stop switch. Replace.
Check ignition coil. Primary coil Replace.
Secondary coil Replace.
Check CDI magneto. Pickup coil Replace.
Source coil Replace.
Replace CDI unit.
No Spark
OK
OK
OK
OK
Spark
No good
No good
No good
No good
No good
No good
OK
No good