What is the compression?

Discussion in 'Lawn Mowing' started by SuperLawn, Nov 10, 2003.

  1. SuperLawn

    SuperLawn LawnSite Member
    Posts: 46

    Hi to all.
    I wounder if you guy can help me.

    First.- What is the compression on Kawasaki 12.5 hp FB460V

    Second.- How to do the compression test
    I have a auto tester, when I try it show like 40 psi

    Any help will be appreciate:D
  2. G-father

    G-father LawnSite Member
    Posts: 174

    40 psi sounds low. Make sure you turn over the engine a few times. As long as the auto tester is not leaking you should be fine.
  3. SuperLawn

    SuperLawn LawnSite Member
    Posts: 46

    Thank you
    For your replied, I agree with you 40 psi is to low, I was hoping somebody knew the right psi.
  4. Albemarle Lawn

    Albemarle Lawn LawnSite Bronze Member
    Posts: 1,544

    40 PSI??? It think your Kawi is DOA

    Does that thing even run? I know in a car engine if you don't have at least 90 PSI it won't light off.
  5. TLS

    TLS LawnSite Fanatic
    Posts: 7,937

    3 words....

    Automatic Compresion Release
  6. SuperLawn

    SuperLawn LawnSite Member
    Posts: 46

    Sorry, but what is ACR?
  7. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    ACR is a device that opens the exhaust valve briefly right after the intake valve closes. It enables you to pull start the engine.

    That being said the minimum compression should be 71 psi.
  8. SuperLawn

    SuperLawn LawnSite Member
    Posts: 46

    Thank you,

    For all the replies

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