GS400 compression

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  • jprice90
    • Feb 2026

    #1

    GS400 compression

    what should the compression be on these engines?
    it's a 1978, I can get one for $300.
    a little rough, been sitting a few years. Carbs are off and were in the process of getting cleaned.
    Inside of the tank is really clean.

    I couldnt find anything on this.
  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #2
    Compression, usually if there's low compression it's because the valves are too tight. For $300 you can't go wrong if it's complete and more or less running.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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