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ENGINE BACKFIRES
POSSIBLE CAUSE SOLUTION
Weak spark from spark plug Inspect, clean and/or replace spark plug
Incorrect spark plug gap or
heat range
Set gap to specs or replace plug
Old or non-recommended fuel Replace with fresh recommended fuel
Incorrectly installed spark plug
wires
Your dealer can assist
Mechanical failure Your dealer can assist
Loose ignition connections Check all connections and tighten
Water present in fuel Replace with fresh recommended fuel
ENGINE PINGS OR KNOCKS
POSSIBLE CAUSE SOLUTION
Poor quality or low octane fuel Replace with recommended fuel
Incorrect ignition timing Your authorized dealer can assist
Incorrect spark plug gap or
heat range
Set gap to specs or replace plugs
ENGINE RUNS IRREGULARLY, STALLS OR MISFIRES
POSSIBLE CAUSE SOLUTION
Fouled or defective spark plug
(s)
Inspect, clean and/or replace spark plugs
Worn or defective spark plug
wires
Your authorized dealer can assist
Incorrect spark plug gap or
heat range
Set gap to specs or replace plugs
Loose ignition connections Check all connections and tighten
Water present in fuel Replace with new fuel
Low battery voltage Recharge battery to 12.8 VDC
Kinked or plugged fuel tank
vent line
Inspect and replace
Incorrect fuel Replace with recommended fuel
Clogged air filter Inspect and clean or replace
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TROUBLESHOOTING
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