Ignition Coil; Replacement Of Spark-Plug Cap - Yamaha 20C Service Manual

ELEC
CLEANING, INSPECTION AND REPAIR
M52502-0*

IGNITION COIL

1) Inspect the high-tension cables and spark-plug
caps for damage and cracks.
2) Measure the resistance of the primary coil.
Ignition coil resistance:
Primary coil:
0.26 – 0.35 Ω at 20 deg.C (68 deg.F)
3) Measure the resistance of the secondary coil.
Ignition coil resistance:
Secondary coil:
6.8 – 10.2 kΩ at 20 deg.C (68 deg.F)
M53001-0

REPLACEMENT OF SPARK-PLUG CAP

(Normal plug cap)
1) Remove the spark-plug cap by pulling the cap,
and remove the plug-cap spring from the high-
tension cable.
2) Cut about 5 mm (0.2 in) off the end of the high-
tension cable.
3) Referring to the diagram, strip about 5 mm (0.2
in) of the insulation off the end of the high-ten-
sion cable, and fit the plug cap-spring.
4) Push the cap-spring into the plug-cap.
1 Bend
2 Contact
(Resistor plug cap)
1) Remove the spark-plug cap by turning the cap.
2) Install the spark-plug cap to the high-tension
cable.
8-6
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