backfires? 1979 suzuki gs850 motorcycle

1979 SUZUKI
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JW9442
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I'm trying to figure out why it backfires mostly when im slowing down while in gear it also doesn't run real smooth when it is cold if you have any ideas please help me out I check all plugs they all spark but one was a little wet unlike the rest but still seems like its ok i also have ran two bottles of gumout though in the gas tank thanx for the help
Jun 14, 2007 at 11:11 PM
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DAVE H
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sounds like an injector blockage as you already suspect
Apr 8, 2009 at 9:04 AM