Yamaha WR450F(S) Owner's Service Manual page 668

ELECTRIC STARTING SYSTEM
3
2
1
a
DIODE INSPECTION
1. Remove the diode from wire harness.
2. Inspect:
Diode continuity
G
Use pocket tester (tester selection posi-
tion Ω × 1)
Tester (+) →
Blue/Red terminal 1
Tester (–) →
Sky blue terminal 2
Tester (+) →
Blue/Red terminal 1
Tester (–) →
Blue/Yellow terminal 3
Tester (+) →
Sky blue terminal 2
Tester (–) →
Blue/Red terminal 1
Tester (+) →
Blue/Yellow terminal 3
Tester (–) →
Blue/Red terminal 1
Incorrect continuity → Replace.
START SWITCH INSPECTION
1. Inspect:
Start switch continuity
G
Tester (+) lead → Black lead 1
Tester (–) lead → Black lead 2
PUSH IN
FREE
No continuous while being pushed → Replace.
Continuous while being freed → Replace.
2. Inspect:
Rubber part a
G
Tears/damage → Replace.
6 - 11
–
ELEC
Continuous
Continuous
No
continuous
No
continuous
Tester selec-
B B
tor position
1 2
Ω × 1
+