2007-2009 Honda TRX300EX TRX300X service manual, Page 82Get this manual
FUEL SYSTEM
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 ntake air leak Contaminateddeteriorated fuelClogged jets Improper choke operation Improper throttle operation No spark at plug (faulty ignition systempage 17-4) 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 Choke stuck open 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 Di rty ai clea ner Clogged slow circuit Faulty ignition system (page 17-4) Afterburn when engine braking is used Lean mixture in slow circuit Faulty ignition system (page 17-4) Backfiring or misfiring during acceleration Lean mixture Faulty ignition system (page 17-4) Poor performance (driveability) and poor fuel economy Clogged fuel system Faulty ignition system (page 17-4)