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Thread: Engine Fluttering Sound

  1. #41
    Senior Member rippin209's Avatar
    Bike: 2012 NC700X
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    Hearing that the throttle body was loose is an odd problem but explains the symptoms. I remember reading this thread awhile back and recently had similar problems.
    No noticeable power loss but it felt like riding something with a carburetor with the choke on our when it's cold.
    Not noticeable (at least to me) at an idle or when above 4,000 rpm but under load (when riding) it was definitely not right.
    I thought bad gas or a vacuum leak so I take out the air filter and there's a small gasket on both the top half and bottom half of the air box and part of it was out of place, lined it all up put it back together (did the EFI reset) and sure enough problem is gone.

    It doesn't take much to make a noticeable difference on the NC apparently

  2. #42
    Senior Member
    Bike: '12 NC700XC
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    Intake tract leak could easily swamp the ECU's demand (control) authority to adjust pulse width on the injectors.

  3. #43
    Commuter Extraordinaire Engine Fluttering Sound
    Engine Fluttering Sound
    SergeantChuck's Avatar
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    Both Friday and Saturday, I sprayed starting fluid all around the throttle body area with no reaction by the engine. I even expanded the spraying a little further than the throttle body and still nothing. Looking like it is not a vacuum leak. My next step will probably be to change the injectors and fuel rail.

  4. #44
    Commuter Extraordinaire Engine Fluttering Sound
    Engine Fluttering Sound
    SergeantChuck's Avatar
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    Quote Originally Posted by rippin209 View Post
    I thought bad gas or a vacuum leak so I take out the air filter and there's a small gasket on both the top half and bottom half of the air box and part of it was out of place, lined it all up put it back together (did the EFI reset) and sure enough problem is gone.

    It doesn't take much to make a noticeable difference on the NC apparently
    I'll take a look at this. I have had the air box apart many times and could have missed that but I think it is good. I have also done the EFI reset. I did not try a reset after fixing the throttle body leak.

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