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  1. #1
    boudin's Avatar
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    VX110 Compression Test

    I have an opportunity to pick-up a 05 VX110 tomorrow for a very good price. Boat I'm told runs, but will just quit sometimes -- owner frustrated and just wants to get rid of it -- thinks it's an electrical issue, but who knows.

    I've rebuilt Yamaha 2-strokes, and Kawasaki 4-strokes, but not the Yamaha's 4-strokes... yet, so I'm lacking a service manual. I searched around, but could not seem to come up with an answer to a couple of basic questions:

    a) Compression test expected psi?
    b) What size is the spark plug hole? (I can't find my 10mm adapter.)

    Can anybody help?

    -Boudin


  2. #2
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by boudin View Post
    I have an opportunity to pick-up a 05 VX110 tomorrow for a very good price. Boat I'm told runs, but will just quit sometimes -- owner frustrated and just wants to get rid of it -- thinks it's an electrical issue, but who knows.

    I've rebuilt Yamaha 2-strokes, and Kawasaki 4-strokes, but not the Yamaha's 4-strokes... yet, so I'm lacking a service manual. I searched around, but could not seem to come up with an answer to a couple of basic questions:

    a) Compression test expected psi?
    b) What size is the spark plug hole? (I can't find my 10mm adapter.)

    Can anybody help?

    -Boudin
    -compression ratio is 11.5:1... book says 165psi (I think), but I have seen much higher... just make sure they are all close to each other

    -10mm adapter for the compression hose

  3. #3
    boudin's Avatar
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    Thanks. Bought a new gauge from Northern Tool with a 10mm adapter. Ended up being 180 psi +/- 2 psi in all four holes. Good.

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