Honda CRF125F 2020 Owner's Manual page 142

Taking Care of the Unexpected
SYMPTOM: Starter motor doesn't operate.
POSSIBLE CAUSE
ignition switch OFF
transmission not in neutral
blown fuse
battery lead loose
low (or dead) battery
faulty starter motor
132
Taking Care of the Unexpected
Turn the ignition switch ON.
Shift into neutral.
Replace with a new fuse of the same rating (page 136).
Tighten the battery lead.
Charge the battery (page 114). If charging doesn't help,
see your dealer.
If all possible causes are negative, the starter motor may
be faulty. See your dealer.
WHAT TO DO