Compression test trimmers?

Discussion in 'Mechanic and Repair' started by Lawnworks, Mar 25, 2008.

  1. Lawnworks

    Lawnworks LawnSite Fanatic
    from usa
    Messages: 5,407

    Is there any way to tell if a trimmer is shot? I have a couple that might be on there last leg... I hate to buy some parts to get them running and waste time and money.
  2. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    What brand of trimmers are they? Do you feel any compression resistance on the pull rope?
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Remove the muffler then look at the piston/rings and cylinder wall through the exhaust port. If you see a lot of scratches/grooves/discoloration etc. they may not be worth fooling with.
  4. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    You'll eventually want to get a test tool but you can probably get a dealer to check the compression for you, if that's all you need.
  5. Lawnworks

    Lawnworks LawnSite Fanatic
    from usa
    Messages: 5,407

    I will try taking off the muffler... the trimmers feel good as far pulling the rope. Trying to avoid the dealer as much as possible. If you want it done right these days... you have to do it yourself.
  6. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

  7. jkason

    jkason LawnSite Senior Member
    Messages: 546

    Check out the link MowerMedic provided. That's what I use for a guideline.

    BTW - 60 psi for a 4-cycle mower.

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