Yamaha YW50P Service Manual page 168

.o..T.o° SVSTEM I':":C I I
T R O U B L E S H O O T I N G
IF I G N I T I O N S Y S T E M S H O U L D B E C O M E I N O P E R A T I V E
(NO S P A R K OR I N T E R M I T T E N T SPARK)
NOTE:
• Remove the following parts before troubleshooting.
1) Battery box cover 4) Tail cover
2) Center cowling 5) Side cover (right)
3) Rear carrier 6) Handlebar cover (front)
• Use the following special tools in this troubleshooting.
~ 1 Dynamic spark tester:YM-34487 I ~ 1 Pocket tester:Yu-03112
1. Spark plug
• Check the spark plug condition.
• Check the spark plug type.
• Checkthe spark plug gap.
Refer to the "SPARK PLUG INSPECTION"
section in the CHAPTER 3.
~ CORRECT
2. Ignition spark gap
• Disconnect the spark plug cap from spark
plug.
• Connect the dynamic spark tester (~ as
shown.
(~ Spark plug cap
• Checkthe ignition spark gap (~.
• Start engine, and increase spark gap until
misfire occurs.
~ Minimum spark gap:
6.0 mm (0.24 in)
I OUT OF SPECIFI-
CATION OR NO
SPARK
*
Standard spark plug:
BPR7HS (NGK)
Spark plug gap:
0.6~0.7 mm(0.02~0.03 in)
INCORRECT
I Spark plug is faulty, replace it or repair plug
gap.
l g l l 0 2 0 1
MEETS SPECIFICATION
I Ignition system is good.
7-10