High RPM Engine chatter | Victory Motorcycles: Motorcycle Forums

High RPM Engine chatter

Discussion in 'Tech Q&A' started by slickvic, Mar 10, 2021.

  1. slickvic

    slickvic Well-Known Member

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    That pretty much explains it. I developed some engine noise during my Daytona trip. Wondering if anyone has had a similar issue. Motor runs fine at cruise and regular riding. When getting on it and running up to max rpm this loud chatter appears as the revs climb past 3500 and gets more pronounced in the higher rpm
     
  2. VicVisionBulldog

    VicVisionBulldog VOG Police Chief

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    We need to know more.

    Let's start with what oil you were using?

    :rofl2::rofl2::rofl2:




    I know that was no help but I couldn't resist. So no code, running fine, just a chatter? Not pinging?
     
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  3. slickvic

    slickvic Well-Known Member

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    There was pinging earlier into the trip on the way up. The noise started last night heading back to our hotel. There was a moment of spirited riding involved.
     
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  4. Half_Crazy

    Half_Crazy Well-Known Member

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    Could something be loose and rattling? Are you sure it's engine sound?
     
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  5. iabob

    iabob Well-Known Member

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    I was thinking predetonation...
     
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  6. TwoManyXS1Bs

    TwoManyXS1Bs Active Member

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    Run it up to the "chattering" rpm, then vary the throttle. See if the sound changes any.

    No sound change - likely valvetrain, drivetrain.
    Sound change - likely piston slap, conrods, crank.

    The frequency of the sound can help.
    3,600 rpms is 60 revs per second.
    Ever hear 60hz power line hum?

    A clatter at 60hz would relate to crank/conrods/pistons.

    A clatter at half that, 30hz, would relate to valves.

    Sounds like time for an oil particulate analysis...

    Edit: Just remembered, I had a clattering sound that I traced to a loose exhaust shield clamp...
     
    Last edited: Mar 11, 2021
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  7. slickvic

    slickvic Well-Known Member

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    Sorry. I dozed off. Nothing seems loose causing the rattle. It only happens heading to the top of the power band. I also noticed at idle the motor seems noisier.
    Cruising at speed in 4th 5th and 6th all sounds fine. Roll on the throttle and it starts to appear becoming louder as I approach 5k. I back off the throttle of course at that point and maintain speed and power easily.
     
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  8. TwoManyXS1Bs

    TwoManyXS1Bs Active Member

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    I used a wooden hammer handle, tapped all around the exhaust, found the loose clamp.

    Do you have a mechanics stethoscope?
     
  9. slickvic

    slickvic Well-Known Member

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    I thought that. It’s too motor evident. I appreciate your analysis. Don’t like what I’m hearing both motor and analysis but appreciate just the same. Dammm I just did the rockers in my wife’s jeep. Had enough with the vehicle expenses already.
     
  10. slickvic

    slickvic Well-Known Member

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    Regarding Piston slap, con rod, crank ...... would this not show sooner than top of power band ? What of the three could cause this chatter noise. Cracks ? Hole in piston ?
     
  11. slickvic

    slickvic Well-Known Member

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    Maybe @PreachSF can chime in on this with some input. After all he will be the one working on it if that’s what it takes.
     
  12. TwoManyXS1Bs

    TwoManyXS1Bs Active Member

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    Kinda hard to describe this stuff on a forum.

    I'm a seat-of-the-pants diagnostician, gotta see it, feel it, hear it, smell it, taste it, rub it against my cheek.

    The mechanics stethoscope is really revealing, especially if you have more bikes to compare to...
     
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  13. bikendad

    bikendad Well-Known Member

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    Start with the easy stuff, possible exhaust header gasket. Give those header nuts a twist or 2 and see if they tighten down.
     
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  14. Chattanooga_Mark

    Chattanooga_Mark Well-Known Member

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    Possibly a lifter losing pressure? Piston slap, holed piston = no way in my book.
     
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  15. slickvic

    slickvic Well-Known Member

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    I though the same. It runs too good down low. Actually still pulls plenty strong until you reach that point in the upper rpms where it starts that chatter. Nothing like marbles or a bucket of nails in vibration sound (detonation). I thought head gasket but again when I got it home I thought the motor just sitting and idling was noisier than usual. I can’t compare the engine noise to my 16 magnum as that bike has always sounded totally different. The 16 has a certain whine to it. The 11 is more quiet with an orchestra of mechanical components in operation together. Sounds more broken in more loose. Weird how different they both are.
     
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