OperationNote: Determine the left and right sides of themachine from the normal operating position.Before OperationBefore Operation SafetyGeneral Safety• Shut off the engine, remove the key (if equipped),and wait for all movement to stop before you leavethe operator’s position. Allow the machine to coolbefore adjusting, servicing, cleaning, or storing it.• Become familiar with the safe operation of theequipment, operator controls, and safety signs.• Check that all guards and safety devices are inplace and working properly.• Always inspect the machine to ensure that thecutting disc, bolt, spacers and retainer are notworn or damaged.• Inspect the area where you will use the machineand remove all objects that could interfere withthe operation of the machine or that the machinecould throw.• Adjusting the cutting height may bring you intocontact with the moving cutting disc, causingserious injury.• Replace a faulty muffler.Fuel Safety• Fuel is extremely flammable and highlyexplosive. A fire or explosion from fuel can burnyou and others and can damage property.– To prevent a static charge from igniting the fuel,place the container and/or machine directly onthe ground before filling, not in a vehicle or onan object.– Add or drain fuel to the fuel tank outdoors, inan open area, when the engine is cold. Wipeup any fuel that spills.– Fill the fuel tank outdoors, in an open area,when the engine is cold. Wipe up any fuel thatspills.– Do not handle fuel when smoking or around anopen flame or sparks.– Do not remove the fuel cap or add fuel to thetank while the engine is running or hot.– If you spill fuel, do not attempt to start theengine. Avoid creating a source of ignition untilthe fuel vapors have dissipated.– Store fuel in an approved container and keepit out of the reach of children.– Replace the cap on the fuel tank and all fuelcontainers securely.• Fuel is harmful or fatal if swallowed. Long-termexposure to vapors can cause serious injury andillness.– Avoid prolonged breathing of vapors.– Keep your hands and face away from thenozzle and the fuel-tank opening.– Keep fuel away from your eyes and skin.Fuel SpecificationType Unleaded gasolineMinimum octane rating 87 (US) or 91 (researchoctane; outside the US)Ethanol No more than 10% by volumeMethanol NoneMTBE (methyl tertiary butylether)Less than 15% by volumeOil Do not add to the fuelUse only clean, fresh (no more than 30 days old), fuelfrom a reputable source.Important: To reduce starting problems, add fuelstabilizer/conditioner to fresh fuel as directed bythe fuel-stabilizer/conditioner manufacturer.Filling the Fuel TankNote: Refer to your engine owner’s manual foradditional information.1. Clean around the fuel-tank cap and remove thecap from the tank.2. Fill the fuel tank with the specified fuel as shownin Figure 20.11