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Intermittent backfiring

Discussion in 'Motorcycle Tech Talk' started by samvan, Aug 30, 2015.

  1. samvan

    samvan Active Member

    Joined:
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    Location:
    wichita,kansas
    What are some causes for intermittent back firing with Hi- compression motors. Mine has done it twice during maybe 50 or so starts, I have a 117 and 10: 8 comp, The fuel octane is 91. I sometimes add 4 oz of boost with 6 gal of fuel. The bike runs good and plugs look good with approx 150 miles on them.
    samvan, Aug 30, 2015
    #1
  3. Lucifer

    Lucifer Well-Known Member

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    Cape Breton NS,Canada
    A little unburnt fuel in the exhaust pipe can ignite and sound like a shotgun blast out of the muffler, happened to me a couple of times,carb was set a little rich,scares the hell out of anyone close by...also check for an exhaust leak.
    Lucifer, Aug 31, 2015
    #2
  4. baggerpaul

    baggerpaul Well-Known Member

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    south fl.
    More details on the build please
    baggerpaul, Sep 2, 2015
    #3

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