2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 89Get this manual
FUELSVSTEM
TROUBLESHOOTING
Engine cranks but won't start No fuel in tank No fuel to carburetorClogged fuel strainerClogged fuel lineClogged fuel tank breather hose Too much fuel getting to the engineClogged air cleanerFlooded carburetor Intake air leak Contaminateddeteriorated fuelClogged jets Improper choke operation Improper throttle operation No spark at plug (faulty ignition systemSee page 18-4) Lean mixture Clogged fuel jets Faulty float valve Float level too low Restricted fuel line Clogged carburetor air vent hose Restricted fuel tank breather hose Intake air leak Faulty throttle valve Rich mixture Clogged air jets Faulty float valve Float level too high Dirty air cleaner Worn jet needle or needle jet Engine stalls, hard to start, rough idling Restricted fuel line Fuel mixture too leanrich Contaminateddeteriorated fuelClogged jets Intake air leak Misadjusted idle speed Misadjusted pilot screw Restricted fuel tank breather hose Clogged air cleaner Clogged slow circuit Faulty ignition system (page 18-4) Afterburn when engine braking is used Lean mixture in slow circuit Faulty ignition system (page 18-4) Backfiring or misfiring during acceleration Lean mixture Faulty ignition system (page 18-4) Poor performance Idriveability) and poor fuel economy Clogged fuel system Faulty ignition system (page 18-4)