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  1. #1

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    GP1300 stuffed piston

    Did a compression test this morn to find cylinders 1 and 3 all good at 120psi, but cylinder 2 had 0 psi.
    So I pulled the head and found out why it was at 0, one stuffed piston with a damaged jug and head. Looks like it was getting no oil as it was bone dry, piston rings gave out and got
    cooked.
    Question, is the head and jug repairable?
    Also where is the best place to buy spares?
    TIA

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  2. #2

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  3. #3

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  4. #4
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    I don't see any major scoring of the cylinder, just aluminum buildup. It can probably be cleaned up with judicious use of muriatic acid and honing.

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    Quote Originally Posted by steve45 View Post
    I don't see any major scoring of the cylinder, just aluminum buildup. It can probably be cleaned up with judicious use of muriatic acid and honing.
    Yeah Iíll look at doing that, what about the head do u think itís salvageable?
    I also noticed a little it of water in cylinder 2ís crankcase, maybe a seal gone?

  6. #6
    Happily Self-Employed WFO's Avatar
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    looks like the ring jumped the locator pin. note the open gap on the exh side of piston. Im pretty sure the top of the exh port is damaged?

    Also are those sleeved? Hard to tell from the pics.

  7. #7
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    Quote Originally Posted by Shadyraro View Post
    Yeah I’ll look at doing that, what about the head do u think it’s salvageable?
    I also noticed a little it of water in cylinder 2’s crankcase, maybe a seal gone?
    water is most likely from leaking head gasket

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  9. #8

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    Quote Originally Posted by WFO View Post
    looks like the ring jumped the locator pin. note the open gap on the exh side of piston. Im pretty sure the top of the exh port is damaged?

    Also are those sleeved? Hard to tell from the pics.
    Youíre spot on WFO, safe to say that jug is stuffed?

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  10. #9
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    Quote Originally Posted by Shadyraro View Post
    You’re spot on WFO, safe to say that jug is stuffed?

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    if its nikasil, yes

    sleeved can maybe be bored oversize

    personally I dont use iron sleeves in these motors

  11. #10

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    Iím not sure if itís sleeved or not, how can you tell?
    Also do you think the head is repairable? It has quite a bit of pitting on it.
    Now Iím wondering if I need to pull the motor to check the crank, it seemed to turn freely by hand.

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