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Slight engine knock

This is a discussion on Slight engine knock within the X2/X4 Engine forums, part of the Yamaha Wolverine X2 & X4 847cc SxS category; My X4 has 60 hours and the other day I fired up the machine to go riding with my wife and noticed a slight pecking ...

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Thread: Slight engine knock

  1. #1
    Slow Poke mvarner's Avatar
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    Slight engine knock

    My X4 has 60 hours and the other day I fired up the machine to go riding with my wife and noticed a slight pecking noise. The oil level is perfect and I always wait for the machine to fully warm up before moving it. I am pretty concerned about it given that it is just out of warranty. I will likely take it in to dealer for service, but wanted to get some feedback from folks. I found a YouTube video with the same noise (https://m.youtube.com/watch?v=8pIEm4fJV5I).
    Has anyone had this pop up on their machine?
    ————-
    ‘18 Yamaha Wolverine X4 - Blue
    28" ITP Blackwater Evolution
    OEM Windshield and Soft Back Cover
    Warn Provantage 3500 w/ Wireless Remote
    27" LED Front and 12" LED Rear Lightbars
    EMP Side Mirrors/ Rocky Mtn Tusk Rear View Mirror

  2. #2
    Slow Poke mvarner's Avatar
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    Must’ve all been in my head. Yamaha service checked it out. The valves are within specs and with it running alongside a new one and a used one, they could not discern a difference in engine noise. They tightened a loose heat shield bolt but other than that my x4 is good to go. Feeling relieved that everything is ok.
    ————-
    ‘18 Yamaha Wolverine X4 - Blue
    28" ITP Blackwater Evolution
    OEM Windshield and Soft Back Cover
    Warn Provantage 3500 w/ Wireless Remote
    27" LED Front and 12" LED Rear Lightbars
    EMP Side Mirrors/ Rocky Mtn Tusk Rear View Mirror

  3. #3
    Paper Boy
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    Quote Originally Posted by mvarner View Post
    Must’ve all been in my head. Yamaha service checked it out. The valves are within specs and with it running alongside a new one and a used one, they could not discern a difference in engine noise. They tightened a loose heat shield bolt but other than that my x4 is good to go. Feeling relieved that everything is ok.
    that's great news
    2019 Wolverine x4 Camo

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    Paper Boy Footlong's Avatar
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    Sounded completely normal to me. Mine sounds the exact same

  6. #5
    Lead Super Moderator MORSNO's Avatar
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    All of my Yamaha Grizzly's had exhaust heat shields that rattled, it took a few months of heat cycling and tightening clamps to get rid of the rattle noises.
    2016 Alpine White Wolverine R-Spec SE
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  7. #6
    Experienced wolvymanx4's Avatar
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    Thats good news. Makes me feel better about mine. There are times that I thought mine may have had a slight knock. But I have had it in to the dealer for its break in service and they said everything is fine as well. And it has always ran perfect.
    2018 X4 Special Edition
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    Gladiator ATR 28X10R14 Tires
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  8. #7
    Weekender
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    Mine knocking noise goes away after about 10 minutes of riding. I just chalked it up to some kind of exhaust rattle knock until it warms and expands.
    MORSNO and wolvymanx4 like this.

  9. #8
    Speed Demon
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    In auto's they call is Piston Slap. It occurs is the piston clearance is too wide when its cold. Maybe by design or too small a piston. Given they restrict the engine until its warmed up to the temp requred. I would not address this as a problem if it did not knock at normal unrestricted temperature.

    PS: SLAP ME IF I AM WRONG
    wolvymanx4 likes this.
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