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If the unit should start to vibrate abnormally, stop the engine and check immediately for the cause. Vibration is generally a warning of trouble. Stop operation when another person approaches. Stop the engine whenever you leave the operating position before making any repairs, adjustment, or inspections. Stop the engine whenever leaving the tiller unattended. When cleaning, repairing, or inspecting make certain tines and all moving parts have stopped. Disconnect spark plug wire and keep wire awa