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
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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

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

    bayron, Jul 21, 2003
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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
    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
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