bottom end/top end????

Discussion in 'Motorcycle Racing' started by Kevin Arouza, Jul 21, 2003.

  1. Kevin Arouza

    Kevin Arouza Guest

    I am thinking of getting a TZ125 or RS125. I keep seeing the terms
    "only 1 race on top end" or "new bottom end"... sorry if this is a
    stupid question, but what exactly are they referring to? Pistons?
    Piston rings?? cylinder heads?
     
    Kevin Arouza, Jul 21, 2003
    #1

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  2. Kevin Arouza

    bayron Guest

    Hi kevin,

    Top end is cylinders/pistons rings/needle bearings for small end of con-rod.

    Bottom end is mainly the crank/seals/bearings.

    Make sure BOTH are right (especially for the track!!). Very few moving
    parts in a two stroke, but it is critical that they work together in
    harmony.

    Then you got the all important jettting and timing. Can change when the
    weather changes.

    RD400man
     
    bayron, Jul 21, 2003
    #2

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  3. Kevin Arouza

    jim Guest

    Fresh top end normally refers to new piston and rings
    New bottom end is a new crank assembly.
    These components have a finite lifetime and need replacement on a regular
    schedule.
    Failure to do so will mean reliabiltity problems.
    And finishing a race weekend should be at the top of your list.
     
    jim, Jul 21, 2003
    #3

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