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Sputtering on take-off

Discussion in 'XJ Technical Chat' started by Rusty81, Aug 29, 2020.

  1. Rusty81

    Rusty81 Member

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    My 700 airhead is running well, but noticed that after driving for awhile, it wants to sputter when leaving a stoplight. I have to give it what seems like more throttle than I should and it wants to lurch then take off.
    Carb wet set is good. Waiting on some new jets for the carbs still. Factory setting Jets are in and plugs look good, But stepping up for filter/exhaust that are on it. Hoping that’ll solve the issue, but figured I’d ask the crowd...
     
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Way not enough info here. Clues, though.

    "Carb wet set is good" I assume you mean float levels so that's a plus.

    You indicated a need to "step up" (jetting, I assume?) "for filter/exhaust that are on it." Whoa, big clue.

    So what we still need to know is:

    -Were carbs vacuum sync'ed?
    -ARE VALVE CLEARANCES in spec?.
    -Exactly what modifications have been made to stock intake and exhaust?

    Once we know those answers we might be able to help.
     
  3. Rusty81

    Rusty81 Member

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    The valve clearances are in spec and the carbs have been sync’ed.
    The exhaust is a 4-into-1 set up that it came to me with and a UNI filter.
    Someone had put the jets for a 750 in the carb, so I ordered the stock fuel/air jets from chacal to start, but waiting now on some larger jets to arrive.
     
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Keeping everything about your project in one thread is helpful.
     

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