TROUBLESHOOTING

ENGINE DOES NOT START OR IS HARD TO START

1. Fuel Line Inspection

Check fuel flow to carburetor.

Does fuel reach the carburetor?

IMO — • Clogged fuel hose or fuel strainer

• Clogged fuel valve

• Clogged fuel tank breather hose

YES — GO TO STEP 2.

2. Spark Plug Inspection Remove and inspect spark plug.

Is the spark plug wet?

YES — • Flooded carburetor

• Throttle valve open

• Dirty air cleaner

• Improperly adjusted pilot screw

NO — GO TO STEP 3.

3. 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 ignition coil wire

• Faulty ignition coil

• Faulty igniting pulse generator

• Faulty exciter coil

• Faulty engine stop button

• Faulty ignition control module (ICM)

NO — GO TO STEP 4.

4. Engine Starting Condition

Start engine by 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

NO — GO TO STEP 5.

5. Cylinder Compression Inspection

Test cylinder compression.

Is the compression low?

YES — • Valve clearance too small

• Valve stuck open

• Worn cylinder and piston rings

• Damaged cylinder head gasket

• Seized valve

• Improper valve timing

• ’05 — ’07: Faulty decompressor cam

• After ’07: Faulty decompressor shaft

[1] If the engine runs rich exiting a corner, turn the pilot screw clockwise to lean the mixture.

• If the engine runs lean exiting a corner, turn the pilot screw counterclockwise to richen the mix­ture.

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