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Thread: Knock knock

  1. #1
    Senior Member rbm's Avatar
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    Knock knock

    So, I was riding yesterday and came very close to stalling a few times and heard a definite knock, not sure if it was a rod knock or piston slap. Has anyone experienced this on your TW?

  2. #2
    Senior Member small's's Avatar
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    Yep you were lugging the engine at low rpm.

  3. #3
    Senior Member rbm's Avatar
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    Quote Originally Posted by small's View Post
    Yep you were lugging the engine at low rpm.
    Yep, I definitely was, I guess I never lugged her that low previously. Just curious if others have experienced the knock or if my bottom end is getting tired.

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  5. #4
    Senior Member Dryden-Tdub's Avatar
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    Quote Originally Posted by rbm View Post
    Yep, I definitely was, I guess I never lugged her that low previously. Just curious if others have experienced the knock or if my bottom end is getting tired.
    No expert but even a brand new TW will make that noise when lugged hard. From experience.



    Tom

  6. #5
    Member mlong's Avatar
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    Yes, mine will do it too. 2013 with 800 miles on it. If I neglect or forget to downshift and give it some throttle it with have a low freq. knock for a couple of seconds. No big thing. Once the rpms pick up a little it goes away. Mark

  7. #6
    Mel
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    Senior Member Mel's Avatar
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    In a lot of motors, the knock you hear is a piston distortion knock from pre-ignition. I have never seen it damage an engine unless it is done excessively, then it will definitely blow a hole in the top of the piston. This is true for all gas engines. MY RECOMMENDATION: Prevent doing it at all costs!
    Mel

  8. #7
    Senior Member rbm's Avatar
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    Thanks for all the replies! I'm less worried now, and I'll keep the revs up higher in the woods.

  9. #8
    Senior Member scotti158's Avatar
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    Mine also does it, seems to do it more if it's hot. 91 octane with no ethanol helps some.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  10. #9
    Senior Member troll's Avatar
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    already been said ^^^ pre-detonation... limit lugging...

  11. #10
    Senior Member MSWRC's Avatar
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    As everyone else stated... But a well adjusted carburetor helps limit the knock.
    littletommy likes this.

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