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High RPM deceleration back fire

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  • High RPM deceleration back fire

    Sounds like I'm shooting at Ducks!! Is the Coasting Enricher adjustable.

  • #2
    I don't think so, but if the plastic cover for it cracks, It'll do just what you are describing.


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    • #3
      if it is a carb bike check the vacuum line rubber cap on the top of the intake manifold to see if it fell off or is damaged. replace it when you see that it is and the issue will go away. It is very common that the rubber vacuum caps dry rot and cause a vacuum leak and a lean pop on decel.

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      • #4
        Thanks guy's I'll check the plastic cover, and see if I lost that line cap!

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        • #5
          Backfiring is caused by a lean condition OR air leak.

          You can adjust the air pilot screw and check for air leaks.
          It can be exhaust leaking between the cylinder head and the exhaust pipe or air intake leak. NOT the air filter.

          Jetting can be incorrect if you have not changed the jetting and you have a non stock air filter and non stock exhaust system.

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          • #6
            You didn't mention what you have for an exhaust system... installing any aftermarket system requires a little finesse to make sure all joints/connections are well sealed, and don't permit any cold, outside air leakage.

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            • Nwrodie
              Nwrodie commented
              Editing a comment
              It is stock exhaust, with the Stage -III mod. Carb jets are 175, 37.5, and the PMS is 3.5 turns from light seat.

            • Questcap
              Questcap commented
              Editing a comment
              Well, in that case... I also have one with stock cans having no guts in them... The Stage 3 mod, and mine will also pop some, but not as badly as you described!

          • #7
            yase, but did u say backfire out carb or exhaust? assuming exhaust, assuming this just started, no changes, bike didnt sit for long time. maybe eddie murphy stuck a banana in your tailpipe.
            critters in air filter, leaky intake or exhaust at the head..........

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            • Nwrodie
              Nwrodie commented
              Editing a comment
              Backfires out the exhaust, like gun shots, I have been thinking about new exhaust gaskets, been on since I bought the bike 7 years ago. It don't sit very much, I ride it to work quite a lot, has 32K miles on it.

          • #8
            Might just put a 3/8 inch ratchet on it and make sure it's snug Bose OE m copper gaskets they don't compress much and I haven't seen my reuse them

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            • #9
              I just reuse them

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