2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 331Get this manual
1 TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
1Fuel line Inspection Check fue flow to carburetor
Does fuel reach carburetor?
NOClogged fuel line or strainer Clogged fuel valve Clogged fuel fill cap breatherGO TO STEP 2
2Spark Plug Inspection Remove and inspect spark plug
Is the spark plug wet?
YESFlooded carburetor Throttle valve open Dirty air cleaner Improperly adjusted pi lot screw
- GO TO STEP 3
3Spark Test Perform spa rk test
Is there weak or no spark?