richb
Joined: Dec 29, 2005
Points: 14
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DIAGNOSING ENGINE CONDITION FROM SPARK PLUG
Original Message Jan 16, 2006 9:57 am |
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Tecumseh HM 100. My plug insulator is black like it's running rich ,buti t's not a sooty deposit. It's slightly oily and has what appear to be bits of semi hard carbon peppered around the interior of the plug and insulator. The exaust is not smokey. Any idea what engine condition would cause the plug to look this way? Thanks RDB
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