If
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Check
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Poor Engine Performance
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Fuel
· 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.
Break-in:
· Improper break-in or incomplete break-in time. Repeat break-in following proper procedures, or extend break-in time 5 hours before suspecting machine problems.
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Engine Will Not Start
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Brake is not pushed down.
PTO lever switch is in ON position.
Fuse is blown.
Spark plug wire is loose or disconnected.
Spark plug not gapped correctly.
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Engine Is Hard To Start
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Fuel filter is gummed or plugged.
Spark plug is fouled.
Faulty spark plug or wire.
Spark plug is not gapped correctly.
Loose or corroded electrical connections.
Stale fuel.
Choke adjusted incorrectly.
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Engine Misses Under Load
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Faulty spark plug.
Stale fuel.
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Engine Vapor Locks
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Fuel tank vent plugged.
Dirt in fuel filter.
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Engine Runs Unevenly (Surges)
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Engine not broken-in.
Cooling fins plugged.
Loose electrical connections.
Choke or throttle cable sticking.
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Engine Overheats
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Air cleaner element plugged.
Engine air intake screen plugged.
Engine oil low.
Model GX345 - Radiator cooling fins plugged.
Engine operated too long at slow engine speed.
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Engine Will Not Idle
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Spark plug not gapped correctly.
Faulty spark plug.
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Engine Has Low Power or Compression
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Engine not broken-in.
Engine overheating.
Too much oil in engine.
Dirty air cleaner.
Faulty spark plug.
Travel speed is too fast for conditions.
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Engine Knocks
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Low engine speed.
Stale or low octane fuel.
Engine overloaded.
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Engine Backfires
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Faulty spark plug.
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High Oil Consumption
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Engine not broken-in.
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Blue or White Exhaust Smoke
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Engine not broken-in.
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Spark Plugs Foul
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Engine not broken-in.
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Fuel in the Engine Oil
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Engine not broken-in.
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