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  1. #1

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    FX HO white letters on side of case?

    Anyone know what the four white letter markings mean on the side of FX HO cases? Iv'e got a set of new cases with three B's and on C. I thought it was for the piston size but Yamaha only sells one standard piston. Couldn't find anything in the service manual.
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  2. #2
    powerstroke specialist mikegp's Avatar
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    very interesting , I have pull two of these ho and never notice they had a letter there. maybe for the rod journals?

  3. #3

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    Here is a picture of the bad case that had all B's. I feel it has something to do with the cylinder bore. The bad engine had a B also on top of all four pistons. I do know rod journals sizes are numbers stamped on the crank and the five main bearing journal are number stamped on the outer case.
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  4. #4
    powerstroke specialist mikegp's Avatar
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    what makes no sense is why down there if it has to do with the cylinders? I will imagine will be close to the top. have you read the manual? I have it I will take a look. also check with the oem part diagram , it may show there if there is differences in bore.

  5. #5
    powerstroke specialist mikegp's Avatar
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    the only parts I see that list multiple options are the connecting rod bearing and mains, pistons are std .

  6. #6

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    Update-
    Number three hole measures slightly larger than the other three.
    The picture shows the stamped on top of the piston.
    Talked to Boats.net tech support and unsurprisingly they didn't know but said the would call Yamaha and get back.
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  7. #7
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by cougar View Post
    Update-
    Number three hole measures slightly larger than the other three.
    The picture shows the stamped on top of the piston.
    Talked to Boats.net tech support and unsurprisingly they didn't know but said the would call Yamaha and get back.
    let us know
    yamaha sells only one size piston for that engine [std]

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