Yamaha YFM250XL(C) Service Manual page 362

*
Spark plug gap:
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
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)
5.Spark plug cap resistance
Remove the spark plug cap.
Connect the pocket tester ( Ω × 1 k) to the
spark plug cap.
Check that the spark plug cap has the
specified resistance.
Spark plug cap resistance:
10 k Ω at 20 ˚C (68˚F)
*
C0NTINUITY
CORRECT
OUT OF
SPECIFICATION
OR NO SPARK
MEETS
SPECIFICATION
– 43 –
IGNITION SYSTEM
INCORRECT
Repair or replace the spark plug.
MEETS SPECIFICATION
The ignition system is not faulty.
OUT OF SPECIFICATION
Replace the spark plug cap.
– +
ELEC