Yamaha TT600R Service Manual page 316

3. Spark plug.
•
Check the conditions of the spark plug.
•
Check the type of spark plug used.
•
Check the electrodes gap.
Standard spark plug:
DPR8EA-9 (NGK), DPR9EA-9
Electrodes gap:
DPR8EA-9, DPR9EA-9 (NGK)
0.8 ~ 0.9 mm
4. Amplitude of the ignition spark.
•
Detach the spark plug cap from the spark
plug.
•
Connect the dynamic spark tester (1) as
shown in the figure.
(2) Spark plug cover (3) Spark plug
•
Turn the main switch ON.
•
Check the amplitude of the ignition spark.
•
Start the engine and increase the ampli-
tude until the ignition becomes discontin-
uous.
Spark amplitude if the ignition
system is efficient:
6.0 mm
*
YES
THE IGNITION SYSTEM IS INEFFICIENT
OR THERE IS NO SPARK
*
IGNITION SYSTEM
OUT OF SPECIFICATION
Correct the electrodes gap or replace the spark
plug.
IN COMPLIANCE WITH SPECIFICATIONS
Minimum spark amplitude.
7-14
ELEC