Yamaha WR450F(R) Owner's Service Manual page 302

ELECTRIC STARTING SYSTEM
3
4
2
1
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
G
Rust/dust/looseness/short-circuit →
Repair or replace.
STARTER MOTOR OPERATION
1. Connect the positive battery terminal 1
and starter motor lead 2 with a jumper
lead 3.
Not operate → Repair or replace the
starter motor.
WARNING
A wire that is used as a jumper lead must
G
have at least the same capacity or more
as that of the battery lead, otherwise the
jumper lead may burn.
This check is likely to produce sparks,
G
therefore make sure nothing flammable is
in the vicinity.
STARTING CIRCUIT CUT-OFF RELAY
INSPECTION
1. Remove:
Starting circuit cut-off relay
G
2. Inspect:
Starting circuit cut-off relay conduct
G
Use 12 V battery.
Battery (+) lead → Blue/Black lead 1
Battery (–) lead → Brown lead 2
Tester (+) lead → Blue/White lead 3
Tester (–) lead → Black lead 4
Connected
to battery
Not
connected
to battery
6 - 9
– +
ELEC
Tester selec-
L/W B
tor position
3 4
Ω × 1