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  1. #1

    Default 1995 Yamaha 25 hp 2 stroke compression spec

    Model no. C25MSHT.

    Iím running a compression test on my outboard but I donít know what the normal range of compression specs is. I know the two cylinders shouldnít have more than a 10-15 psi difference.

    Anybody done this before or know the spec?

  2. #2

    Default Re: 1995 Yamaha 25 hp 2 stroke compression spec

    125-150 psi is good compression

  3. #3

    Default Re: 1995 Yamaha 25 hp 2 stroke compression spec

    Thanks. I got 135psi on both cylinders.

  4. #4

    Default Re: 1995 Yamaha 25 hp 2 stroke compression spec


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