Yamaha YFM250XN 2001 Supplementary Service Manual page 49

Spark plug gap:
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
for CDN
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)
for Europe/Oceania
4.Ignition spark gap
Disconnect the spark plug cap from the
spark plug.
Connect the ignition checker 1 as shown.
2 Spark plug cap
Turn the main switch to "ON".
Check the ignition spark gap a.
Crank the engine by pushing the starter
switch and increase the spark gap until a
misfire occurs.
Minimum spark gap:
6.0 mm (0.24 in)
*
C0NTINUITY
CORRECT
OUT OF
SPECIFICATION
OR NO SPARK
*
IGNITION SYSTEM
INCORRECT
Repair or replace the spark plug.
MEETS SPECIFICATION
The ignition system is not faulty.
MEETS SPECIFICATION
The ignition system is not faulty.
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ELEC