Diagnose & Troubleshoot
Yard-Man Walk Behind

Engine runs erratically Possible Causes and Corrective Actions

Spark plug boot loose
Connect and tighten spark plug boot.
Blocked fuel line
Replace fuel line.
Fuel is stale
Refill with fresh fuel.
Vent in gas cap is plugged
Clear vent.
Water or dirt in fuel system
Drain fuel tank and refill with fresh fuel.
Dirty air filter
Replace air filter.
Unit running with CHOKE on (if equipped)
Adjust CHOKE to off position.