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  1. #1

    Default Compression check on a Johnson 50hp

    What is the correct procedure for taking a compression check on a Johnson 55hp and is the same for all outboards?

  2. #2
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    9,845

    Default Re: Compression check on a Johnson 50hp

    Ground sparkplug leads. -----------Screw in a compression tester and crank it over. ---------------There is no need to " open the throttle " on a 2 stroke engine !!!!-------Read the highest pressure obtained.

  3. #3

    Default Re: Compression check on a Johnson 50hp

    Thank you, I wanted to make sure we were going to do it correctly.......

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