New Bottom End

Discussion in 'Motorized Bicycle General Discussion' started by fischer550, Sep 16, 2015.

  1. fischer550

    fischer550 Member

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    I very badly damaged the crank case on my bike, so I'm getting a new bottom end (with a new crank) I am going to be using the same piston, rings, and top end I have used for 300 miles.

    Do I have to start the break in process all over?
     
  2. Davezilla

    Davezilla New Member

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    If you're using the same cylinder, piston, and rings all you'll need to do is put everything on the new bottom end and you won't have to re break it in, the main reason for breaking an engine in is to seat the rings so you'll be ok as long as you're using all the original top end parts.
     
  3. LandSpeedRecord

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    Ha ha in the time I was posting a reply Dave said the same thing. What he said⬆⬆⬆⬆⬆
     
    #3 LandSpeedRecord, Sep 16, 2015
    Last edited: Sep 16, 2015
  4. crassius

    crassius Well-Known Member

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    should be no problem is both rod length & crank stroke are the same - so many diffs out there now : (
     
  5. fischer550

    fischer550 Member

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    So absolutely no break in for a brand new bottom end? I can just run wot from the start like ive been doing?
     
  6. crassius

    crassius Well-Known Member

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    may not be needed, but I like to go gently on bearing surfaces that are new and finished by a chinese factory rather than one with good quality control
     
  7. fischer550

    fischer550 Member

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    this is a dax bottom end
     
  8. Davezilla

    Davezilla New Member

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    Dax bottom end = No Worries... That's all I use when building up a performance engine...
    No issues at all so far
     
  9. fischer550

    fischer550 Member

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    ok I'm just not gonna break it in at all then
     

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