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Engine will not start
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Battery has low voltage.
Loose or corroded battery connections.
Fusible link is melted.
Spark plug wire is loose or disconnected.
Faulty spark plug or coil.
No fuel or improper fuel.
Plugged fuel filter.
Defective starter solenoid.
Open-circuit in wiring.
Water in fuel tank.
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Engine is hard to start
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Missing or damaged air restrictor.
Engine is cold.
Plugged fuel filter.
Engine oil viscosity too heavy.
Spark plug is fouled.
Faulty spark plug or wire.
Loose or corroded electrical connections.
Stale or improper fuel.
Choke not being used or adjusted incorrectly.
Water in fuel tank.
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Engine misses under load
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Faulty spark plug.
Stale or dirty fuel.
Plugged fuel filter.
Faulty coil or wire.
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Engine vapor locks
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Poor quality fuel or methanol.
Very hot weather conditions and very high loading condition.
Fuel tank vent plugged.
Dirt in fuel filter.
Seasonally-blended fuel with incorrect specifications.
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Engine runs unevenly
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Missing or damaged air restrictor.
Cooling fins plugged.
Loose electrical connections.
Choke or throttle cable sticking.
Fuel line or fuel filter plugged.
Stale or dirty fuel.
Water in fuel tank.
Improper fuel.
Air cleaner element plugged.
Spark plug is fouled.
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Engine overheats
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Air cleaner element missing or plugged.
Carburetor air intake tube plugged.
Engine fins plugged.
Engine oil low.
Engine operated too long at slow engine speed.
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Engine loses power
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Engine overheating.
Too much oil in engine.
Faulty spark plug.
Fuel supply being restricted.
Fuel filter plugged
Fuel line pinched or kinked.
Improper fuel.
Air cleaner element plugged.
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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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After-bang on shutdown - allow engine to idle for a few minutes
before shutting engine down.
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