Checking The Relays; Checking The Ignition Coil - Yamaha MBK MW125 2014 Service Manual

10.Install:
• Center cover
Refer to "GENERAL CHASSIS (1)" on page
4-1.
EAS30553

CHECKING THE RELAYS

Check each switch for continuity with the pocket
tester. If the continuity reading is incorrect, re-
place the relay.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
1. Disconnect the relay from the wire harness.
2. Connect the pocket tester (Ω × 1) and battery
(12 V) to the relay terminals as shown.
Check the relay operation.
Out of specification → Replace.
Starter relay
3
R
B
4
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
Starting circuit cut-off relay
2 4
L/Y L/G
Br L/W
1 3
1. Positive battery terminal
R R
L/W G/Y
1 2
ELECTRICAL COMPONENTS
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
Headlight relay
3
4
2
Y/B
L
Br
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
EAS30558

CHECKING THE IGNITION COIL

The following procedure applies to all of the igni-
tion coil.
1. Check:
• Primary coil resistance
Out of specification → Replace.
Primary coil resistance
2.16–2.64 Ω
▼ ▼▼▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
a. Remove the ignition coil from the spark plug.
b. Connect the pocket tester (Ω × 1) to the igni-
tion coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
red/white "1"
• Negative tester probe →
orange "2"
8-63
+
1
Br
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼