Electrical System; Checking And Charging The Battery; Checking The Fuses; Checking The Ignition Timing - Yamaha YZ250FM 2021 Owner's Service Manual

EAM20137

ELECTRICAL SYSTEM

EAM30256

CHECKING AND CHARGING THE BATTERY

Refer to "CHECKING AND CHARGING THE
BATTERY" on page 8-43.
EAM30505

CHECKING THE FUSES

Refer to "CHECKING THE FUSES" on page
8-43.
EAM30255

CHECKING THE IGNITION TIMING

1. Remove:
• Timing mark accessing screw "1"
2. Attach:
• Timing light "1"
• Digital tachometer "2"
(to the high tension cord "3")
Timing light
90890-03141
Timing light
YU-03141
Digital tachometer
90890-06760
Digital tachometer
YU-39951-B
1
3. Adjust:
• Engine idling speed
Refer to "CHECKING THE ENGINE IDLING
SPEED" on page 3-11.
4. Check:
• Ignition timing
Check whether the alignment mark "a" on the
left crankcase cover is within the firing range
"b" on the generator rotor.
Incorrect firing range  Check generator ro-
tor and crankshaft position sensor.
5. Install:
• Timing mark accessing screw
1
3 3
2 2
3-35
ELECTRICAL SYSTEM
a a
b b
Timing mark accessing screw
6 N·m (0.6 kgf·m, 4.4 lb·ft)