Yamaha YTZ250S 1986 Service Manual page 116

5 C.D.I. Magneto (Pickup coil) test
Disconnect the magneto leads, and use the
pocket tester to check the resistance of the
pickup coil.
Pickup coil resistance:
White/ Red - Black
10.70± 10%
If other
than specified
Q
6 Connectors check-up
-,
Replace
pickup coil
1. Check the connectors and couplers for
looseness of joining ends.
2.
Keep the connectors and couplers from
dirt or rust.
Wrong
I
Correct
I
connection
OK
5-6
Q
7 Ignition coil test
Use the pocket tester to check the resistance
of primary and secondary windings of the ig-
nition coil.
Primary coil
resistance:
0.290 ± 15%
If other
than specified
Secondary coil
resistance:
4.0kO ± 15%
Replace
I----l~
ignition coil
Replace
~----------~.~
~
C.D.I. unit
L..-_ _ _ _ _ _ - '
Make sure the wire harness is in a posi-
tion it will not make contact with exhaust
pipe, which could short out C.D.I. unit.