Yamaha YTZ250S 1986 Service Manual page 115

Q
2 Spark gap test
Remove the spark plug cap and check the
spark.
CD
5 mm (0.20 in)
".
Hold the high tension lead 5 mm (0.20 in) from
the head, and kick the engine.
3
1 Good spark
1
1. Check plug cap
2. Check spark plug
1 No spark
I
Q
Engine stop switch
Disconnect the Black/White and Black leads
of engine stop switch at C.D.I. unit, and use
the pocket tester to check the resistance of the
engine stop switch.
Switch RUN OFF
Tester
00
on
5-5
1-----.1
Faulty
~
Replace the
switch
o
4 C.D.I. Magneto (Source coil) test
Disconnect the magneto leads, and use the
pocket tester to check the resistance of the
magneto coils.
Source coil resistance:
Brown - Black: 315U± 10%
If other
Replace
than specified
source coil
o