Honda CBR 125RW 2007 Owner's Manual page 153

If Your Engine Quits or Won't Start
SYMPTOM: Engine starts, but runs poorly @nt'dL
POSSIBLE CAUSE WHAT TO DO
sooty exhaust (rich fuel See your Honda dealer.
mixture)
detonates or pings under If applicable, switch to the recommended octane
load gasoline (page 70 ) or change your brand of
gasoline. If the problem persists, see your Honda
dealer.
afterfires (backfires) May damage catalytic converter.
See your Honda dealer.
pre-ignition (runs on after May damage catalytic converter.
ignition switched OFF) See your Honda dealer.
Taking Care of the Unexpected 143