| Here are the five popular spark plug patterns for two-stroke engines.
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Publish date: 03.18.2003 11:22 |
Heavy
Carbon
This plug has heavy carbon build up. This engine had a blown crank
seal on the tranny side of the crank. Tranny oil entered the
crankcase and was burned in the combustion chamber. Engines like
this will billow thick blue smoke out the exhaust pipe.
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Wet
Fouled
This plug is wet fouled. The spark plug's heat range is either too
cold or the carb jetting is too rich.
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Sand
Glazed
This plug has a shiny appearance. The engine had a problem with air
filter sealing. Sand entered through the filter and into the engine.
The high combustion temperatures caused the sand to melt and form
glass around the spark plug. |
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Melted
Aluminum
This plug has tiny globs of aluminum packed around the insulator.
The engine suffered a meltdown from ignition timing that was
advanced too much. The heat could not transfer from the spark plug
fast enough and the center of the piston melted causing the molten
aluminum to collect on the plug.
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Perfect
Color
This is a perfect plug. The color is mocha brown so the carb jetting
is optimum. The first three threads are black signifying the plug's
heat range is matched to the application. There are relatively low
deposits considering that this engine was run on regular pump
petrol. |
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External Source
Source Name: Eric Gorrs Forward Motion
Source URL:
http://www.eric-gorr.com/techarticles/sparkplugs.html
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