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Poor Engine Performance
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Dirt in fuel system or fuel is old. Replace fuel with fresh
stabilized fuel. Obtain fuel from another supplier before suspecting
machine problems. Suppliers blend fuels differently and changing suppliers
will generally solve any performance problems
Fuel blended with alcohol or ether may contribute to performance
problems by causing gum and varnish deposits, especially if fuel is
stored for several weeks or more. Obtain fresh fuel.
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Engine Will Not Start - No Crank
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Park brake not locked.
Motion control levers not in Start/Shutdown position.
Mower is engaged.
Defective brake, mower engagement, or key switch.
Electrical problem - See Electrical Troubleshooting Section
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Engine Cranks But Will Not Start
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Spark plug wire is loose or disconnected.
Improper fuel.
Plugged fuel filter.
Electrical problem - See Electrical Troubleshooting Section
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Engine Is Hard To Start
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Carburetor is not adjusted properly or dirty.
Choke not fully closing.
Plugged fuel filter.
Faulty spark plug.
Stale or improper fuel.
Loose or corroded electrical connections.
Engine oil viscosity.
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Engine Runs Unevenly
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Cooling fins plugged.
Loose electrical connections.
Choke or throttle cable sticking.
Choke not fully open.
Fuel line or fuel filter plugged.
Stale or dirty fuel.
Improper fuel.
Air cleaner element plugged.
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Engine Misses Under Load
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Faulty spark plug.
Stale or dirty fuel.
Plugged fuel filter.
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Engine Vapor Locks
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Fuel tank vent plugged.
Dirt in fuel filter.
Cooling fins plugged.
Loose hose connection at fuel filter or fuel pump.
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Engine Overheats
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Engine air intake screen plugged.
Cooling fins plugged.
Engine oil low or too high.
Engine operated too long at a slow idle speed.
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Engine Will Not Idle
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Spark plug not gapped correctly.
Faulty spark plug.
Operator raising off the seat.
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Engine Knocks
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Stale or low octane fuel.
Engine overloaded.
Low engine speed.
Oil level low.
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Engine Stops Or Misses When Operating On Hillsides
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Fuel tank less than half full of fuel.
Operator raising off of the seat.
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Engine Backfires
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Faulty spark plug.
Operator raising off of the seat.
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Engine Loses Power
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Engine overheating.
Too much oil in engine.
Dirty air cleaner.
Faulty spark plug.
Travel speed is too fast for conditions.
Improper fuel.
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Excessive Fuel Consumption
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Choke is not fully open.
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Black Exhaust Smoke
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Air filter is dirty or oil soaked.
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