Diagnostic CenterSelf-Propelled Mowers

Engine runs erratic

Possible Causes

Corrective Actions

1Spark plug wire loose

Connect and tighten spark plug wire

Blocked fuel line or stale fuel

Clean fuel line and fill tank with fresh gas

Vent in gas cap is plugged

Clear Vent

Water or dirt in fuel system

Drain fuel tank and refill with fresh fuel

Carburetor is out of adjustment

Adjust carburetor according to your engine manual

Engine is overfilled with oil

Drain oil and fill to proper amount

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