2001 YAMAHA TTR125 electrical

3 - 29
INSP
ADJ
ELECTRICAL/SPARK PLUG INSPECTION
EC370000
ELECTRICAL
EC371001
SPARK PLUG INSPECTION
1. Remove:
lSpark plug
2. Inspect:
lElectrode 1
Wear/damage ® Replace.
lInsulator color 2
Normal condition is a medium to light
tan color.
Distinctly different color ® Check the
engine condition.
NOTE:
When the engine runs for many hours at low
speeds, the spark plug insulator will become
sooty, even if the engine and carburetor are in
good operating condition.
3. Measure:
lPlug gap a
Use a wire gauge or thickness gauge.
Out of specification ® Regap.
4. Clean the plug with a spark plug cleaner
if necessary.
Spark plug gap:
0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
Standard spark plug:
CR7HSA (NGK)
U22FSR-U (DENSO)
5. Tighten:
lSpark plug
NOTE:
lBefore installing a spark plug, clean the gas-
ket surface and plug surface.
lFinger-tighten a the spark plug before
torquing to specification b.
T R..13 Nm (1.3 m · kg, 9.4 ft · lb)

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
1
CDI unit
2
Engine stop switch
3
Ignition coil
4
CDI magneto
5
Spark plug
COLOR 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
6

6 - 5
–+ELEC

IGNITION SYSTEM
CDI MAGNETO INSPECTION
1. Inspect:
l
Pickup coil resistance
Out of specification ® Replace.
Tester (+) lead ® Red lead 1
Tester (–) lead ® White lead 2
Pickup coil
resistanceTester selector
position
248 ~ 372 W at
20 ˚C (68 ˚F)W ´ 100
2. Inspect:
lCharging coil resistance
Out of specification ® Replace.
Tester (+) lead ® Brown lead 1
Tester (–) lead ® Green lead 2
Charging coil
resistanceTester selector
position
688 ~ 1,032 W
at 20 ˚C (68 ˚F)W ´ 100
EC628000
CDI UNIT INSPECTION
Check all electrical components. If no fault is
found, replace the CDI unit. Then check the
electrical components again.