Home Forums Tech Talk Issue at around 45 mph

This topic contains 6 replies, has 5 voices, and was last updated by  tony zambos 1 year, 5 months ago.

  • Author
  • #87576


    I am currently running B&S World Formula with a titan clutch(7 2005) on a Maranello frame.  My issue is when I hit about 45 or so there is a chatter / shutter feeling you get in the rear of Kart  I am trying to figure out what it can be, but it is consistent.  I am new to Karting so I figured I would ask around.  the clutch looks to be fine and again it only happens at about 45 miles per hour, but feels rough.


    Thanks in advance

  • #87577

    Greg Wright

    Out of balance wheel?


    Greg Wright
    Rapid Racing Inc.
    Vintage B-Stock Pilot
    "When in doubt Gas it, It won't help but it ends the suspense."

  • #87583


    Thanks for the response. I Do not think that is issue – note it happens for about 1 second and then goes away.  Almost like if you were going over rumple strips in road.  After the 45 it is gone.  It is very consistent, but only for short period of time.

  • #87591

    Matt Martin

    some kind of problem with balance – wheels or otherwise.  If it’s consistently 45mph it’s some sort of resonant frequency caused by rotational parts – engine (rpm), clutch, wheels, brakes, chain, sprocket, etc.


    Or, if you happen to be at 45mph at the same point on the track each time, it could be track related.

  • #87608


    I guess I have to figure out where to start.  I took the clutch off and it didn’t look to be noticeable bad.

  • #87613

    Jim White

    Could you be hitting the rev limiter at the end of the straight?

  • #87672

    tony zambos

    Make a significant change in your gear ratio to determine if the shutter occurs at the same speed or same RPM.
    Check for worn gears, worn chain or too much slack in the chain.

    LAD Specialties customer / tony kart / rotax / kt100

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