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Thread: compression test for KHK

  1. #1
    Join Date
    Aug 2007
    Location
    Illinois
    Posts
    251

    Default compression test for KHK

    What reading should we get when testing for compression? We got 25-30 psi for the rear cylinder and 0.0 psi for the front. I hope to use another testing gauge today to see if the problem is with the instrument and not the engine.
    George Tinkham
    Springfield, IL
    www.virmc.com

    1941 Indian 841
    1948 Indian Chief
    1956 H-D KHK
    1960 CH
    1964 BMW R69S
    1966 Honda Touring Benly (aka "150 Dream")
    1984 Moto Guzzi V65Sp

  2. #2
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    3,631

    Default

    Gosh George,..

    Does it start and run at all?

    If so, the apparatus, or its application, has issues.

    (There's usually more than one.)

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  3. #3

    Default

    start simple George..put your thumb on the plug hole & kick.Testing kickstart with a compression gauge is tricky.On E start you give it a few revolutions,hard to do that on kick statrt

  4. #4
    Join Date
    Aug 2007
    Location
    Illinois
    Posts
    251

    Default

    Quote Originally Posted by T. Cotten View Post
    Gosh George,..

    Does it start and run at all?

    ....Cotten
    It ran when recently reassembled; however, it fouled the front plug quickly. Now, it does not start.
    George Tinkham
    Springfield, IL
    www.virmc.com

    1941 Indian 841
    1948 Indian Chief
    1956 H-D KHK
    1960 CH
    1964 BMW R69S
    1966 Honda Touring Benly (aka "150 Dream")
    1984 Moto Guzzi V65Sp

  5. #5

    Default

    The usual rule of thumb is between 15 and 20 times the static compression ratio at or near sea level.
    KHK 6.8:1, probably closer to 6.5 actual, so 98 to 130 psi, ideally 5% or less diff front to rear.
    When boring: NEVER use 45 pistons.

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