Honda TRX420FPM Owner's Manual page 204

If Your Engine Quits or Won't Start
SYMPTOM:
POSSIBLE CAUSE
high coolant
temperature
runs erratically,
misfires
blubbers (rich fuel
mixture)
sooty exhaust (rich
fuel mixture)
detonates or pings
under load
afterfires (backfires)
pre-ignition (runs on
after ignition
switched OFF)
SYMPTOM:
POSSIBLE CAUSE
poor or inadequate
fuel flow due to
clogged fuel filter
Taking Care of the Unexpected
196
Engine starts, but runs poorly.
Check the high coolant temperature
indicator. Refer to
Coolant T emperature Indicator
Lights,
See your dealer.
See your dealer.
See your dealer.
If applicable, switch to the
recommended octane petrol
(page
petrol. If the problem persists, see
your dealer.
See your dealer.
See your dealer.
Engine starts, but runs poorly or dies when hot.
See your dealer.
(ensure clean fuel supply)
WHAT TO DO
If the High
page 200 .
110 ) or change your brand of
WHAT TO DO