Yamaha YB50 Service Manual page 158

ELECTRICAL SYSTEM
* CHECK ALL CABLE CONNECTIONS
MAIN SWITCH
• The main switch is short
circuited.
SPARK PLUG
• Excessive carbon deposits.
• Damp electrodes.
• Incorrect gap.
• Broken.
SOURCE COIL
• The coils are broken.
TROUBLE SHOOTING
PICK-UP COIL
• The coils are broken.
• Incorrect ignition distribution.
8-1
LOC
AVER
IGNITION COIL
• The primary and secondary
coils are broken or defective.
• The high voltage cable is
defective.
• The spark plug cap is
defective.
CDI UNIT
• CDI unit defective