ignition YAMAHA TTR125 2003 User Guide

6 - 1
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* The illustration shows the TT-R125LWE
12345 7 6890A
EDCB

ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1
CDI unit
2
Main switch
3
Start switch
4
Clutch switch
5
Engine stop switch
6
Starting circuit cut-off
relay
7
Ignition coil
8
Battery
9
Starter relay
0
Fuse
A
Rectifier/regulator
B
Neutral switch
C
CDI magneto
D
Starter motor
E
Spark plug
COLOR 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

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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.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
Pocket 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. 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

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IGNITION SYSTEM
EC622001
SPARK GAP TEST
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester
1
(ignition checker
2
) as shown.

Spark plug cap
3


Spark plug
4

Å
For USA and CDN
ı
Except for USA and CDN
3. Kick the kick starter.
4. Check the ignition spark gap.
5. Start engine, and increase spark gap until
misfire occurs. (for USA and CDN only)
Minimum spark gap:
6.0 mm (0.24 in)
Å
ı

EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:

Couplers and leads connection
Rust/dust/looseness/short-circuit
→

Repair or replace.
MAIN SWITCH INSPECTION
1. Inspect:

Main switch continuity
Check for continuity as follows:
Incorrect continuity
→
Replace.
Tester (+)
→
Red lead
1

Tester (–)
→
Brown lead
2
Continuous
Tester (+)
→

Black/White lead
3
Tester (–)
→
Black lead
4
Continuous
R
1
Br
2
B/W
3
B
4Tester selec-
tor position
ON
Ω × 1
OFF
RB/W
BrB
13
24

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ENGINE STOP SWITCH INSPECTION
1. Inspect:
Engine stop switch continuity
No continuous while being pushed → Replace.
Continuous while being free → Replace. Tester (+) lead → Black lead 1
Tester (–) lead → Black lead 2
B
1B
2Tester selec-
tor position
PUSH IN
Ω × 1
FREE
BB
1
2
EC626002
IGNITION COIL INSPECTION
1. Inspect:
Primary coil resistance
Out of specification → Replace.
2. Inspect:
Secondary coil resistance
Out of specification → Replace.
NOTE:
When inspecting the secondary coil resis-
tance, remove the spark plug cap.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
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

6 - 5
–+ELECIGNITION SYSTEM
CDI MAGNETO INSPECTION
1. Inspect:
Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead 1
Tester (–) lead → White lead 2
Pickup coil
resistanceTester selector
position
248 ~ 372 Ω at
20 ˚C (68 ˚F)Ω × 100
Br G
RW
12
2. Inspect:
Source coil resistance
Out of specification → Replace.
Tester (+) lead → Brown lead 1
Tester (–) lead → Green lead 2
Source coil
resistanceTester selector
position
688 ~ 1,032 Ω
at 20 ˚C (68 ˚F)Ω × 100
Br G
RW
1
2