2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 93Get this manual
FUEL SYSTEM Remove the following- pi lot screwspringwashera-rings Check each jet for wear or damageCheck the pilot screw for stepped wear or damageClean the jets with cleaning solvent and blow open with compressed air
CARBURETOR CLEANING
Remove the strainer screen from the fuel hose jointWash the strainer screen thoroughly in non -flam mable or high flash point solvent until all accumulated dirt has been removedBlow dry it with comp ressed air to clean completely