Yamaha YZ125(D) Owner's Service Manual page 155

CHECKING THE CDI MAGNETO
1. Inspect:
• Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → White/Red lead
"1"
Tester (-) lead → White/Blue lead
"2"
Tester se-
Pickup coil
lector posi-
resistance
248–372 Ω
at 20 °C (68
°F)
2. Inspect:
• Charging coil 1 resistance
Out of specification → Replace.
Tester (+) lead → Black/Red lead
"1"
Tester (-) lead→Green/White lead
"2"
Charging Tester se-
coil 1 resis- lector posi-
tance
720–1,080
Ω at 20 °C
(68 °F)
3. Inspect:
• Charging coil 2 resistance
Out of specification → Replace.
Tester (+) lead → Green/Blue lead
"1"
Tester (-) lead → Black lead "2"
tion
Ω × 100
CHECKING THE CDI UNIT
Check all electrical components. If no
fault is found, replace the CDI unit.
Then check the electrical compo-
nents again.
tion
Ω × 100
Charging Tester se-
coil 2 resis- lector posi-
tance tion
44–66 Ω at
20 °C (68 Ω × 10
°F)
6-5
IGNITION SYSTEM