troubleshooting guide

Problem

Cause

 

 

 

Engine will not start.

Blade switch is engaged.

 

• Steering controls are not locked in the neutral

 

 

position.

 

• Parking brake is not activated.

 

Battery is dead.

 

• Contamination in the carburetor or fuel line.

 

• Fuel supply is closed.

 

• Clogged fuel filter or fuel line.

 

Faulty ignition system.

 

 

 

Starter does not turn the engine over.

Dead battery.

 

• Poor contacts on the battery terminal cable

 

 

connections.

 

Fuse blown.

 

Ignition system faulty.

 

• Fault in the starter safety circuit. See Safety

 

 

System in the Maintenance section

 

 

 

Engine runs rough.

Faulty carburetor.

 

• Clogged fuel filter or jet.

 

• Clogged ventilation valve on the fuel cap.

 

• Fuel tank nearly empty.

 

Fouled spark plug.

 

• Spark plug is loose.

 

• Rich fuel mixture or fuel-air mixture.

 

Wrong fuel type.

 

• Water in the fuel.

 

Clogged air filter.

 

 

 

Engine seems weak.

Clogged air filter.

 

Fouled spark plugs.

 

Carburetor incorrectly adjusted.

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Husqvarna MZ6128ZT / 966613101, MZ5225ZT / 966690501 manual Troubleshooting guide, Problem Cause