Yamaha WR250F 2008 Owner's And Service Manual page 208

CHECKING THE COUPLERS AND
LEADS CONNECTION
1. Check:
• Couplers and leads connection
Rust/dust/looseness/short-circuit
→ Repair or replace.
CHECKING THE STARTER
MOTOR OPERATION
1. Connect the positive battery ter-
minal "1" and starter motor lead
"2" with a jumper lead "3".
Not operate → Repair or replace
the starter motor.
• A wire that is used as a jumper
lead must have at least the same
capacity or more as that of the
battery lead, otherwise the jump-
er lead may burn.
• This check is likely to produce
sparks, therefore make sure
nothing flammable is in the vicin-
ity.
CHECKING THE STARTING
CIRCUIT CUT-OFF RELAY
1. Remove:
• Starting circuit cut-off relay
2. Inspect:
• Starting circuit cut-off relay con-
duction
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"
Result
Conductive (while the
battery is connected)
Not conductive while the battery is
connected → Replace.
Conductive while the battery is not
connected → Replace.
Set the tester selection position to "Ω
× 1".
ELECTRIC STARTING SYSTEM
CHECKING THE STARTER RELAY
1. Remove:
• Starter relay
2. Inspect:
• Starter relay conduction
Use 12 V battery.
Battery (+) lead→Starter relay ter-
minal "1"
Battery (-) lead → Starter relay ter-
minal "2"
Tester (+) lead → Starter relay ter-
minal "3"
Tester (-) lead → Starter relay ter-
minal "4"
Result
Conductive (while the
battery is connected)
Not conductive while the battery is
connected → Replace.
Conductive while the battery is not
connected → Replace.
Set the tester selection position to "Ω
× 1".
CHECKING THE CLUTCH SWITCH
1. Inspect:
• Clutch switch conduction
Tester (+) lead → Black lead "1"
Tester (-) lead → Black lead "2"
Result
Conductive (while the
clutch lever is pulled)
Not conductive while it is pulled → Re-
place.
Conductive while it is freed → Re-
place.
Set the tester selection position to "Ω
× 1".
7-7
CHECKING THE DIODE
1. Remove the diode from wire har-
ness.
2. Inspect:
• Diode continuity
Use pocket tester (tester selec-
tion position Ω × 1)
Tester (+) → Blue/Red
terminal "1"
Tester (-) → Sky blue
terminal "2"
Tester (+) → Blue/Red
terminal "1"
Tester (-) → Blue/Yel-
low terminal "3"
Tester (+) → Sky blue
terminal "2"
Tester (-) → Blue/Red
terminal "1"
Tester (+) → Blue/Yel-
low terminal "3"
Tester (-) → Blue/Red
terminal "1"
Incorrect continuity → Replace.
CHECKING THE START SWITCH
1. Inspect:
• Start switch conduction
Tester (+) lead → Black lead "1"
Tester (-) lead → Black lead "2"
Result
Conductive (while the
start switch is pushed)
Not conductive while it is pushed →
Replace.
Conductive while it is freed → Re-
place.
Set the tester selection position to "Ω
× 1".
Continu-
ous
Continu-
ous
No con-
tinuous
No con-
tinuous