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Compression Reading For KX85?

Discussion in 'Pit Bikes & Mini's' started by razorboy, Aug 26, 2007.

  1. razorboy

    razorboy Rookie DRN Member

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    Hey Guys,

    I think my sons KX85 overheated and did some cylinder damage.
    The problem stemmed from the bike ingesting its own coolant. I had topped it off last Saturday but did not check it again yesterday (mybad)
    The bike ran well and then quit. Will not start now.
    I checked the coolant level again and it seemed way low. I don't think these bikes hold much coolant to begin with?
    Anyway, I want to check the cylinder compression. What should it be about?

    Thanx
    Bernie


  2. griffbones

    griffbones Rookie DRN Member

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    160 - 170 psi seems to be pretty normal for the KX85's and KX100's. The factory manual states 119 - 180 psi as usable operating compression range. 119... who came up with that number? And I have never seen one of the KX85's that made 180 psi either.
  3. Billinin

    Billinin Rookie DRN Member

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    I thought 85cc bikes stock were like 120-125????
  4. Chili

    Chili Lifetime Sponsor - Photog Moderator

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    Back when my kid was on a 99 KX80 it was usually 155-160 psi on a fresh top end.
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