Yamaha WR450FR Owner's Service Manual page 301

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