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Plug fouling

odie1962

New Member
I have a 2002 FDL which has the 88" twin cam. Problem is I have a problem with the back plug fouling, Not often but about every 6 months or so. Front plug looks fine but the back one is all black and covered with suet. causing backfires and such, any ideas?
 
If the plug has a shiney look when you take it out, rather than flat-black sooty, that is an indication of oil consumption----shiney is oil, flat is fuel
 
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