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  1. #1
    TX21's Avatar
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    WTB - 787 RFI cylinder

    Anyone have one? I need one or even two cylinders with everything if you got it (pistons, gaskets, wrist pin bearings).


  2. #2
    96XPSS's Avatar
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    How bad is the cylinders? SD makes OEM once-overs. Can you shoot us a pic or take it to a machinist for micing?

  3. #3
    TX21's Avatar
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    ask and ye shall recieve!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
    96XPSS's Avatar
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    They aren't that bad at all, from what I can see. Are there any deep scratches you can hang your fingernail in while dragging it accross the scratches?

    Do you have a machinist local you can depend on? The cheaper (and best route) would be to buy new once-over OEMs (they come with rings too), and take them to a machinist for boring. Tell him to mic from the piston skirts, and set the clearance up at .006".

  5. #5
    TX21's Avatar
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    Thats the #2 cylinder in both pics, the #1 is good so I didn't post a pic. You can feel the ridges with your finger thats what I am worried about. I think it will lower compression. Whats a once over? I have never hear of that.

  6. #6
    96XPSS's Avatar
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    Sorry...I was assuming you knew what that meant. Once overs are "one size over" stock bore, which is .25mm bigger. The bad cylinder you currently have may hone out (make smooth again) without having to replace the piston. Look at the number stamped on the top of your piston. RFI's have different size pistons from stock carbed engines, sorry I don't remember yours. Mine is 81.89 stock, yours will read 81.92 or something like that. Wear limit is .010". So you can take the damaged cylinder to a machinist, tell him your piston size, let him hone the cylinder and see if the clearance is still within the .010" wear limit. Then you won't have to bore both and replace both pistons.
    Last edited by 96XPSS; 07-17-2007 at 07:47 AM.

  7. #7
    TX21's Avatar
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    These cylinders are not plated? Like a Nikasil plating that has to be done by a special shop? I thought all late model two strokes had this plating. If not great thats a cheap fix for me.

  8. #8
    96XPSS's Avatar
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    No Sea-Doo two-stroke is nikasil...only Yamis.

    Hone away...

  9. #9
    TX21's Avatar
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    Quote Originally Posted by 96XPSS View Post
    No Sea-Doo two-stroke is nikasil...only Yamis.

    Hone away...

    Freakin sweet!!!! .010 is max right so I guess I will just do the next size up. If I had a 81.92 I could go .010 bigger right?
    Last edited by TX21; 07-17-2007 at 10:42 AM.

  10. #10
    TX21's Avatar
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    Cool called a local place getting them fix for $60 per turn around is about 3-4 days. Got a new pistons for $178 (wsm) they have in stock so I should have this ski on the market next week.

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