Yamaha WR450F(R) Owner's Service Manual page 303

ELECTRIC STARTING SYSTEM
STARTER RELAY INSPECTION
1. Remove:
2. Inspect:
Battery (+) lead →
Battery (–) lead →
Tester (+) lead →
Tester (–) lead →
Continuous while not connected to the battery
→ Replace.
Not continuous while connected to the battery
→ Replace.
CLUTCH SWITCH INSPECTION
1. Inspect:
Tester (+) lead → Black lead 1
Tester (–) lead → Black lead 2
No continuous while being pulled → Replace.
Continuous while being freed → Replace.
6 - 10
ELEC
Starter relay
G
Starter relay conduct
G
Use 12 V battery.
Starter relay terminal 1
Starter relay terminal 2
Starter relay terminal 3
Starter relay terminal 4
Ter- Ter-
minal minal
3
Connected
to battery
Not
connected
to battery
Clutch switch continuity
G
B B
1 2
PULL
FREE
– +
Tester selec-
tor position
4
Ω × 1
Tester selec-
tor position
Ω × 1