ignition YAMAHA TTR125 2002 User Guide

6 - 3
–+ELEC

IGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester
1
(ignition checker
2
) as shown.
l
Spark plug cap
3

l
Spark plug
4


For USA and CDN
õ
Except for USA and CDN
3. Kick the kickstarter crank.
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)

õ

EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
l
Couplers and leads connection
Rust/dust/looseness/short-circuit
®

Repair or replace.
ENGINE STOP SWITCH INSPECTION
1. Inspect:
l
Engine stop switch conduct.
Not continuous while being pushed
®

Replace.
Continuous while being freed
®
Replace.
Tester (+) lead
®
Black/White lead
1

Tester (–) lead
®
Black lead
2

B/W
1
B
2
Tester selec-
tor position
PUSH IN
W

´
1
FREE

6 - 4
–+ELEC

IGNITION SYSTEM
EC626002
IGNITION COIL INSPECTION
1. Inspect:
l
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
W
at
20 ˚C (68 ˚F)
W

´
1
2. Inspect:
l
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 k
W
at
20 ˚C (68 ˚F)k
W

´
1

6 - 5
–+ELEC

IGNITION SYSTEM
CDI MAGNETO INSPECTION
1. Inspect:
lPickup 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.