Advice for my 88 440/550
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  1. #1
    PWCToday Regular netdr's Avatar
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    Advice for my 88 440/550

    Any opinion on the condition or pay forward on these? PJS head & copper gasket.
    Front cylinder LR 75.0 FB 75.3
    Rear LR 75.1 FB 75.16
    (mm) left right front back

    Js550 has 75.0 bore, 0.5 over at 75.5 I believe.

    In the pictures, front is right for the cylinders or top for the head.

    The compression was 110 forward 145 rear and nothing is seized. I don't see any scoring on the walls.

    Rings? Bore and hone? New top end (Pistons and bearings)

    IMG_20180915_120619.jpgIMG_20180915_120605.jpgIMG_20180915_120648.jpgIMG_20180915_120632.jpg

  2. #2
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    Re: Advice for my 88 440/550

    how did you measure bore?
    you have 0.3mm difference in out of round bore on one cylinder and 0.06 in the other?

  3. #3
    PWCToday Regular netdr's Avatar
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    Re: Advice for my 88 440/550

    Yep... Bore Gage and calipers.

  4. #4
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    Re: Advice for my 88 440/550

    think you've got your answers right there in your measurements if done accurately.
    seems odd as they usually wear on the trust sides,not so much parallel to crank axis.
    fresh bore time and hope 0.5 clears it up!
    Last edited by restosud; 09-15-2018 at 06:00 PM.

  5. #5
    PWCToday Regular netdr's Avatar
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    Re: Advice for my 88 440/550

    What would cause the out of round? I also have a line on a full built 550 motor...I might just drop that in... After doing the ebox

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