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Fouling out spark plugs and back fire - Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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  • phantomgirl Jul 21, 2008

    04 1200 Sportster - same problem - has been in 2 different dealership service depts for 3 of the last 4 weeks - crank sensor replaced, rejetted TWICE, intake seal replaced - still doing it - but worse. I can't go 3 blocks and the farther I go the worse it gets! Within 2 miles the bike has to sit for about 4 hours before it will crank again!

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Runnin way rich sounds like to me bad rings with blow by will oil fowl but with the back fire i think your runnin rich or timing is off but that shouldn't foul plugs

Posted on Apr 20, 2008

  • andrew kinslow Apr 21, 2008

    my last post was, well, uninteligible pardon me. the fouled plugs come from several different things: oil blow by, trash in the gas and really rich gas mix. since you have back fire I'm thinking running rich is your situation. uncombusted gas can cause back fire so can timing but that wouldn't foul plugs with fouled plugs and backfire I think your running rich.

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