How To 'Break In' a Two Stroke MUST be done after a top end rebuild

Discussion in 'Engine' started by lbwd, May 18, 2007.

  1. 2k1blastr

    2k1blastr New Member

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    ok...i just bought a motor off of ebay,its rebuilt from top to bottom.its bored over .010 and new everything else.so im assuming this would be the way i should break it in?
    its supposed to arrive at my door step mon. feb13.cant wait.
  2. 2k1blastr

    2k1blastr New Member

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    ..and i forgot to include,its been set up for pre-mix.
  3. slickerthanyou

    slickerthanyou New Member

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    Bro there are many ways to do it! Most are correct! The first post is a little overkill. My builder says-

    Last edited by a moderator: Feb 6, 2014
  4. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    I always go a little further, after the heat cycles, re tension the head and jug bolts on a cold motor.

    Ride 2 tanks of fuel at no more than 3/4 throttle at the recommended 32:1 fuel oil mix.

    Then fang it. May be over kill, but been doin it for years, and old habits die hard.
  5. Jacobstaggs22

    Jacobstaggs22 New Member

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    I heard letting it idle was bad ? I thought you had to vary the rpms?
  6. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    Blip the throttle , vary the revs.
  7. iLikeIke

    iLikeIke New Member

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    how i always did it was take it easy one the first tank, riding 15 minutes n lettin it cool. after that i had my ways with it partly of being to dam excited with a new motor.

    as long as you dont overheat it or open the throttle wide open in neutral youll be fine. ive heard a lot of people just skipping the break in process

    look at how you break in a v8. start it and right away after checking timing you go to 2500 rpm for a good half hour. granted 2 strokes are different
  8. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    2 strokes are very different to V8s, you have no cams to break in.
  9. 2-strokeManiac

    2-strokeManiac New Member

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    That is deffinatly the right way to do it!
  10. davidc

    davidc New Member

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    Need help..were can i get a cheap rebuilt kit for my 94 yamahA blaster 200??

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