Honda FourTrax Recon TRX250TM 2019 Owner's Manual page 174

If Your Engine Quits or Won't
Start
SYMPTOM: Engine starts, but runs poorly.
POSSIBLE CAUSE
idles roughly, too fast,
stalls
poor engine
performance at
altitudes above 3,000
feet (1,000 m)
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)
164 Taking Care of the Unexpected
WHAT TO DO
Check engine idle adjustment
(page 112). If the problem
persists, see your dealer.
Ask your dealer to modify the
carburetion with a high
altitude jet.
Refer to High Altitude
Carburetor Adjustment,
page 185.
May damage catalytic
converter. See your dealer.
See your dealer.
See your dealer.
If applicable, switch to the
recommended octane gasoline
(page 91) or change your
brand of gasoline. If the
problem persists, see your
dealer.
May damage catalytic
converter. See your dealer.
May damage catalytic
converter. See your dealer.