TS 125 rebore – clearance?

Forums Technical Two Stroke: Help needed TS 125 rebore – clearance?


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    • #6095

      Trying to sort / rebuild a siezed TS125.
      Freed engine(phew!).
      Two questions for you clever people out there..

      Engine has 150 head – do I need to change it back to 125.

      Local engine shop will re-bore – but he want’s to know what skirt clearance it needs (oh I say).

      Enjoying the taking to bits – getting ready for the rebuild, maybe see some of you people in the spring!

      Thanks in advance


    • #6096
      Brian Thurlow

      Hi Steve.

      I think you will find the clearance is 0.03mm.

    • #6101

      Thank you Brian!

      As ever I asked in two places and got two answers!
      MZ shop suggest 2 to 3 thou (of an inch)

      Don’t want to get his wrong…

    • #6112
      Brian Thurlow

      Hi Steve.

      2 thou is just over 0.0508 mm.
      3 thou is close to maximum allowable wear from what I remember.

      Check with Club Technical Officer.


      Tom Gray
      01429 881668, 8.30 -10pm only
      jeantom30 [at] aol [dot] com

    • #6202
      ‘AAA Dummy

      Tom is right
      As its a 125/150 then running it in is gunner be a right pain 1.5 to 2 thou would be about right thats 40-50 micron in new money
      Three thou would work but it would be a little rattley almost at first start and would settle down to somewhere between 4 to 5 thou (100-125 microns)after running in and this will produce a proper piston slap on cold start up !
      30 microns is a touch to tight and you would have to be a proper saint to get that run in without a nip up
      I have never yet heard a quiet mz without a little rattle /tinkle if it was that would then make it a yamaha !!!! (Suzukis and sakakakis also rattle )

      In conclusion my money is on 0.04-0.05mm for the best compromise

      Others may differ (what does the manual say?)

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