2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 178Get this manual
1G-11 Fuel System:
Diagnostic Information and Procedures
Carburetor Symptom Diagnosis
Condition Starting difficulty Possible cause Clogged starter jetClogged starter jet passageAir leaking from joint between starter body and carburetorImproperly working starter (enricher) plungerClogged or loose slow jetClogged slow jet passageClogged pilot outlet portClogged bypass portStarter (enricher) plunger not fully closedImproperly set pilot screwIncorrect float heightClogged main jetClogged main air jetClogged needle jetImproperly working throttle valveClogged fuel filterIncorrect float heightStarter (enricher) plunger not fully closedWorn or damaged needle valve Broken needle valve spring Improperly working float Foreign matter on the needle valve Incorrect float chamber fuel level