Engine Does Not Start Or Is Hard To Start - Honda TRX450R Service Manual

TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
1. Fuel Line Inspection
Check the fuel flow to the carburetor.
Does the fuel reach the carburetor?
YES - GO TO STEP 4. ('04 - '05)
GO TO STEP 2. (After '05)
NO - • Clogged fuel line or strainer
• Clogged fuel valve
• Clogged fuel fill cap breather hose
2. Throttle Cable Conditon Inspection (After '05 only)
Oprerate the throttle lever.
Do the throttle lever and throttle drum operate smoothly?
YES - GO TO STEP 3.
No - • Improper throttle lever free play adjustment
• Stuck throttle cable
3. Closed Throttle Position Detection System Inspection (After '05 only)
Check the throttle lever and carburetor switches.
Are the throttle lever and/or carburetor switches correct?
Yes - GO TO STEP 4.
No - • Faulty throttle lever switch
• Faulty carburetor switch
4. Spark Plug Inspection
Remove and inspect the spark plug.
Is the spark plug wet?
YES - • Flooded carburetor
• Throttle valve open
• Dirty air cleaner
• Improperly adjusted pilot screw
• Starting enrichment (SE) valve stuck open or damaged ('04 - '05)
NO - GO TO STEP 5.
5. Spark Test
Perform spark test.
Is there weak or no spark?
YES - • Faulty spark plug
• Fouled spark plug
• Loose or disconnected ignition system wires
• Broken or shorted spark plug wire
• Faulty ignition coil
• Faulty exciter coil
• Faulty ignition pulse generator
• Faulty engine stop switch
• Faulty ignition switch
• Faulty ignition control module (ICM)
NO - GO TO STEP 6.
6. Engine Starting Condition
Start the engine by the following normal procedure.
Does the engine start then stops?
Yes - • Improper choke operation
Incorrectly adjusted carburetor
Leaking carburetor insulator
Improper ignition timing (Faulty ICM or ignition pulse generator)
Contaminated fuel
Improper hot start operation (TRX450R)
NO - GO TO STEP 7.
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