Yamaha YP250 Service Manual page 216

:
YP******
4. Ignition spark gap
S Disconnect the spark plug cap from the
spark plug.
S Connect the ignition checker
Spark plug
2
S Turn the main switch to "ON".
S Check the ignition spark gap
S Check the spark by pushing the starter
switch, and increase the spark gap until a
misfire occurs.
Minimum spark gap:
6 mm (0.24 in)
YP******
5. Spark plug cap resistance
S Remove the spark plug cap.
S Connect the pocket tester (
spark plug cap.
NOTE:
S When removing the spark plug cap, do not
pull the spark plug cap from high tension
cord.
S Remove ! Turning counterclockwise.
S Connect ! Turning clockwise.
S Check the high tension cord when connect-
ing the spark plug cap.
S When connecting the spark plug cap, cut
the high tension cord about 5 mm.
Spark plug cap resistance:
5 k (20_C)
:
as shown.
1
.
a
OUT OF SPECIFI-
CATION OR NO
SPARK
1 k) to the
CORRECT
IGNITION SYSTEM
MEETS SPECIFICATION
The ignition system is not faulty.
Tester (+) lead !
Spark plug side
Tester (–) lead !
High tension cord side
OUT OF SPECIFICATION
Replace the spark plug cap.
8-8
ELEC
1
2