Honda CRF125F 2023 Owner's Manual page 143

Taking Care of the Unexpected
SYMPTOM: Engine starts, but runs poorly. (cont'd)
POSSIBLE CAUSE
sooty exhaust (rich fuel
mixture)
detonates or pings under
load
afterfires (backfires)
pre-ignition (runs on after
ignition switched OFF)
134
Taking Care of the Unexpected
See your dealer.
If applicable, switch to the recommended octane gasoline
(page 58) or change your brand of gasoline.
If the problem persists, see your dealer.
See your dealer.
See your dealer.
WHAT TO DO