2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 84Get this manual
FUEL SYSTEM
TROUBLESHOOTING
Engine cra nks but won't start
No fuel in tank No fuel to carburetorClogged fuel stra inerClogged fue lineClogged fue tank breather hose Too much flle gett ing to the engineClogged air cleanerFlooded carburetor Intake air leak Contaminateddeteriorated fuelClogged jets Improper choke operation Improper throttle operation No spark at plug (faliity ignition systempage 17-4 )
lean mixture
Clogged fuel jets Faulty float va lve Float leve too low Restricted fuel line Clogged carburetor air vent hose Restricted fuel tank breather hose Intake air leak Faulty throttle valve
Rich mixt.ure Choke valve closed (ON) Clogged air jets Faulty float valve Fl oa level too high Dirty air cleaner Worn jet needle or needle jet