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 authorized dealer can assist
Mechanical failure
Your authorized 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 spark plug gap or
heat range
Set gap to specs or replace plug
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