Electric Starting System - Yamaha WR250F Owner's Service Manual

4. Inspect:
• Sealed portion of ignition coil "a"
• Spark plug terminal pin "b"
• Threaded portion of spark plug "c"
→
Wear Replace.
CHECKING THE AC MAGNETO
1. Inspect:
• Pickup coil resistance
→
Out of specification
→
Tester (+) lead Red lead "1"
→
Tester (-) lead White lead "2"
Tester se-
Pickup coil
lector posi-
resistance
Ω
248–372
at 20 °C (68
°F)
CHECKING THE NEUTRAL
SWITCH
1. Inspect:
• Neutral switch conduction
→
Tester (+) lead Sky blue lead
"1"
→
Tester (-) lead Ground "2"
Result
Conductive (while gear
is in neutral)
Not conductive while it is in neutral
Replace.
Conductive while it is engaged
place.
Set the tester selection position to
Ω
" × 1".
CHECKING THE CDI UNIT
Check all electrical components. If no
fault is found, replace the CDI unit.
Then check the electrical compo-
nents again.
ELECTRIC STARTING
SYSTEM
STARTING CIRCUIT CUT-OFF
SYSTEM OPERATION
If the main switch is set to "ON", the
starter motor can only operate if at
least one of the following conditions is
met:
• The transmission is in neutral (the
neutral switch is closed).
• The clutch lever is pulled to the han-
Replace.
dlebar (the clutch switch is closed).
The starting circuit cut-off relay pre-
vents the starter motor from operating
when neither of these conditions has
been met. In this instance, the start-
ing circuit cut-off relay is open so cur-
tion
rent cannot reach the starter motor.
When at least one of the above con-
Ω
× 100
ditions has been met the starting cir-
cuit cut-off relay is closed and the
engine can be started by pressing the
start switch.
WHEN THE TRANSMISSION IS IN
NEUTRAL
WHEN THE CLUTCH LEVER IS
PULLED TO THE HANDLEBAR
→
→
Re-

ELECTRIC STARTING SYSTEM

7-5
1. Battery
2. Main fuse
3. Main switch
4. Starting circuit cut-off relay
5. Start switch
6. Diode
7. Clutch switch
8. Neutral switch
9. Starter relay
10. Starter motor