Troubleshooting - Yamaha YQ50 Service Manual

TROUBLESHOOTING

NOTE :
• Remove the following parts before proceeding with the troubleshooting :
1) Side covers (left and right)
• For accurate troubleshooting use the following special tools :
Ignition checker :
90890-06754
1.Spark plug
• Check the spark plug type.
• Check the condition of the spark plug.
• Check the spark plug gap.
Refer to "SPARK PLUG INSPECTION" in
Chapter 3.
Standard spark plug :
BR8HS (NGK)
Spark plug gap :
0.5 ~ 0.7 mm (0.019 ~ 0.028 in)
2.Spark check
• Remove the spark plug cap.
• Connect the ignition checker Q.
W Spark plug cap
E Spark
• Check the length of the spark gap.
• Start the engine and increase the spark
length until the engine begins to misfire.
Minimum spark gap :
6.0 mm (0.24 in)
IGNITION AND STARTING SYSTEM
THE STARTING SYSTEM DOES NOT WORK
(NO SPARK OR IRREGULAR SPARKS).
CORRECT
OUT OF
SPECIFICATION
OR NO SPARK
Pocket tester :
90890-03112
INCORRECT
The spark plug is defective. Replace it or
adjust the spark plug gap.
MEETS SPECIFICATION
Ignition system in good condition.
8-7
ELEC