9 - 11
–
+
ELEC
IGNITION SYSTEM
CORRECT
Spark plug gap:
0.8 ~ 0.9 mm (0.03 ~ 0.04 in)
INCORRECT
Repair or replace the spark plug.
OUT OF
SPECIFICATION
OR NO SPARK
4.Ignition spark gap
●
Disconnect the spark plug cap from the
spark plug.
●
Connect the dynamic spark tester
1
as
shown.
2
Spark plug cap
3
Spark plug
●
Turn the main switch to “ON”.
●
Check the ignition spark gap.
●
Crank the engine by pushing the starter
switch, and increase the spark gap until a
misfiring occurs.
Minimum spark gap:
6.0 mm (0.24 in)
MEETS SPECIFICATION
The ignition system is not faulty.
5.Spark plug cap resistance
●
Remove the spark plug cap.
●
Connect the pocket tester (
Ω
×
1k) to the
spark plug cap.
MEETS
SPECIFICATION
●
Check that the spark plug cap has the
specified resistance.
Spark plug cap resistance:
10 k
Ω
at 20 °C (68 °F)
*
OUT OF SPECIFICATION
Replace the spark plug cap.
Summary of Contents for YFM660FS
Page 1: ...LIT 11616 17 14 5KM 28197 E2 YFM660FS SUPPLEMENTARY SERVICE MANUAL ...
Page 17: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U S A ...
Page 19: ......
Page 20: ......
Page 21: ......
Page 22: ......
Page 23: ......
Page 24: ......
Page 25: ......
Page 26: ......
Page 27: ......
Page 28: ......
Page 29: ......
Page 30: ......
Page 31: ......
Page 32: ......
Page 33: ......
Page 34: ......
Page 35: ......
Page 36: ......
Page 37: ......
Page 38: ......
Page 39: ......
Page 40: ......
Page 41: ......
Page 42: ......
Page 43: ......
Page 44: ......
Page 45: ......
Page 46: ......
Page 47: ......
Page 48: ......
Page 49: ......
Page 50: ......
Page 51: ......
Page 52: ......
Page 53: ......
Page 54: ......
Page 55: ......
Page 56: ......
Page 57: ......
Page 58: ......
Page 59: ......
Page 60: ......
Page 61: ......
Page 62: ......
Page 63: ......
Page 64: ......
Page 65: ......
Page 66: ......
Page 67: ......
Page 68: ......
Page 69: ......
Page 70: ......
Page 71: ......
Page 72: ...YFM660FP SERVICEMANUAL LIT 11616 15 01 5KM 28197 E0 ...
Page 117: ...2 11 SPEC MAINTENANCE SPECIFICATIONS Item Standard Cylinder head tightening sequence ...
Page 417: ...9 3 ELEC CHECKING THE SWITCH ...
Page 478: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U S A ...