Greensmaster Flex 21
Page 3 – 10
Engine
OIL FOULED PRE–IGNITION
WORN
NORMAL
LEAD FOULED CARBON FOULED
OVER HEATING FUSED SPOT DEPOSIT
GAP BRIDGED
Black dry fluffy carbon deposits are found
on insulator tip, electrodes, and exposed
shell surfaces.
Weak ignition, plug heat range too cold, fuel
mixture too rich, or excessive idling may be
the cause.
Replace spark plug.
Has dark black, gray, tan, or yellow depos-
its. May have a fused glazed coating on the
insulator tip.
Caused by highly leaded gasoline.
Replace spark plug.
Gap between electrodes is closed by de-
posit build up.
May be caused by carbon or oil fouling.
Replace spark plug.
Wet black deposits can be found on elec-
trodes, insulator, and in the bore.
Excessive oil entering the combustion
chamber past worn valve guides, valve
stems, rings, piston, and/or cylinder bore.
Replace spark plug.
Has gray or light tan deposits on the firing
tip.
Light gray or white insulator with small gray
brown or black spots. Electrode has a bluish
burnt appearance.
May be caused by engine over heating,
loose spark plug, wrong fuel type, plug heat
range too hot, or incorrect ignition timing.
Replace spark plug.
Has spotty or melted deposits resembling
blisters or bubbles.
Caused by sudden acceleration.
Replace spark plug.
Has severely eroded or worn electrodes.
Caused by normal wear.
Replace spark plug.
Electrodes are melted and the insulator
may be blistered. Metallic deposits on the
insulator indicate engine damage.
Engine overheating, burnt valves, plug heat
range too hot, incorrect ignition timing or ad-
vance, or wrong type of fuel are causes.
Replace spark plug.
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