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  1. #1
    rpa101's Avatar
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    785 sleeve or re plate

    The price to re plate is the same as re sleeve if I re sleeve I can bore to 780 Pistons ? Or is re plating better and going with 750 Pistons ?


  2. #2
    Resident electronics hacker UnityRacing's Avatar
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    This doesn't answer your question, sorry, but is a 785 a 750 with triple pipes? Guess I always thought a 785 was a 785cc.

  3. #3
    ripcuda's Avatar
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    785 (779cc?) Fuji crank in a Fuji case (69.705mm x 68mm ) (750 size pistons, longer throw and rods, exhaust valves) Nikasil cylinder plating
    From here:
    http://www.greenhulk.net/forums/showthread.php?t=114710


    Cheers!

  4. #4
    Resident electronics hacker UnityRacing's Avatar
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    I see. A 750 stroker then.

  5. #5

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    I would replate in my opinion and you can't go with 780 pistons it messes up the port timing to much from what I was told ,don't get me wrong you can do it but it will never be right like they say anything will work but I like it right not rigged

  6. #6
    rpa101's Avatar
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    Thanks Lugs thats what I was looking for have to much time and money in this to start jimmy rigging

  7. #7
    john zigler's Avatar
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    If you put sleeves in, it also takes up space in the transfer and boost ports. IMO this is a poor idea on ANY cyl that was originally plated.

    I can get cyls plated, get you new pistons, etc if you need. Feel free to call the shop 608-743-1305 if I can help.

    Should add, It is also my opinion it is better to run actual 785 pistons, and be sure to have tolerances set up properly, as all that is available is Wiseco, they are a forged piston, and will grow more than a cast piston.

  8. #8
    rpa101's Avatar
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    Wiseco's are out I ride in cold water and have had problems in the past . Are 785 piston still available or do I have to use 750 and bore for tolerance difference?

  9. #9
    ripcuda's Avatar
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    Quote Originally Posted by rpa101 View Post
    Wiseco's are out I ride in cold water and have had problems in the past.
    Can you talk more about your experience with Wiseco's and cold water?

    I have Wiseco's in my MSX 150 (4-stroke) and I ride cold water. I know they're forged and as such expand/contract a tad more and thus need a thorough warm-up before hard use.

    Cheers!

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ripcuda View Post
    Quote Originally Posted by rpa101 View Post
    Wiseco's are out I ride in cold water and have had problems in the past.
    Can you talk more about your experience with Wiseco's and cold water?

    I have Wiseco's in my MSX 150 (4-stroke) and I ride cold water. I know they're forged and as such expand/contract a tad more and thus need a thorough warm-up before hard use.

    Cheers!
    Weber engine is an entirely different kettle of fish compared to a race oriented Polaris 785 2-stroke.

    The Weber has a thermostat and closed loop cooling system, temperature variations inside the engine are much different than the Pro 785.

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