Jumping revs vfr 800

Discussion in '6th Generation 2002-2013' started by BoloVFR, Dec 30, 2025 at 5:04 AM.

  1. BoloVFR

    BoloVFR New Member

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    The problem appeared overnight. Saturday was driving perfectly, but Sunday morning the problem reappeared. It behaved normally three times, the idle was stable, and I drove. If it starts, that's the cause. It only started with the hood open, where it immediately revved up. I've never seen a similar problem or such a variable idle anywhere else. The fuses are good, the pump is turning on, and nothing was done before the problem occurred. Does anyone have any ideas or have seen such a high idle?

    Best regards.
     
    Last edited: Dec 30, 2025 at 9:42 AM


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  2. RllwJoe

    RllwJoe Insider

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    What is "the hood" that you referred to being "open"? Upload a photo of this "hood" please.
     


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  3. BoloVFR

    BoloVFR New Member

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    I'm using a translator. Maybe he did something wrong. What I meant was that I could only start it by opening the throttle, meaning I opened the throttle, and when it started, it would rev up. Otherwise, it wouldn't start. He couldn't maintain idle speed because of that in the video. You can see the revs jumping around; they're very unstable.
     


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  4. squirrelman

    squirrelman Member

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    check for any air leaks or hoses that are loose in the throttle body area.

    do you have a service manual for reference ?
     


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  5. RllwJoe

    RllwJoe Insider

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    Thanks for the clarification.

    What year is this VFR? How many km on the clock?

    Is there any difference between a "cold" engine start, and a "warm" engine start?
    In other words, does the bike idle better when it is either cold (been off for an hour or more), or when it has been running and is warm?
     


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