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  1. #1

    Join Date
    May 2010
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    Toronto,Ontario
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    35

    sick 1997 785 Pro need help

    Ok guys I officially need some help here.

    I took my ski out for the first timethis year; everything was acting normal for about 3 minutes and just out of nowwhere it died. Fired it back up, ran for about 10 seconds and died again. Tried firing it back up but all I got was a very slow crank and nothing.

    Waited about 3 minutes and tried again and it fired, so I quickly headed back to shore and got there just before it died again.

    So now I'm looking everything over and find nothing unusual until I did a compression check and got 120,119,50 Oh nogrrrrr.

    So I pulled the head and took some pics to show you guys and maybe get some feedback

    Link to pics:
    http://imageshack.us/g/804/dsc0607x.jpg/


  2. #2

    Join Date
    Aug 2006
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    Homer Glen Il.
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    109
    you were running very lean for one

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
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    Which cylinder has the low compression?

    What maintenance has been done on this engine?

    What are the carburetor adjustments screws set to?

  4. #4

    Join Date
    Jul 2011
    Location
    Rogers,AR
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    28
    yes

  5. #5
    johnsonmtz's Avatar
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    Oct 2006
    Location
    Mt. Zion Illinois
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    The pictures definitely show lean wash patterns. The symptoms you describe are classic lean seizures.

    KJ

  6. #6

    Join Date
    May 2010
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    Toronto,Ontario
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    35
    Its the PTO cylinder thats low. As for maintenance I've just followed my FSM, That engine was rebuilt 5 years ago and I've only put maybe 10 hours on it. I just checked the carb setting and all three are set to 1/2 low 3/4 high

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
    Posts
    17,329
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    You do not have the right head gaskets installed. Those are for a 780, not a 785.

    I wonder how much of a role that played in this problem?

  8. #8

    Join Date
    Aug 2006
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    Homer Glen Il.
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    there where some company's that sold head gaskets for the 785 like that but i don't think they where the problem that piston wash is very dry and weird looking

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
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    I totally agree, it just caught my attention about the gasket.

    If the ski sat for so long fuel system issues I'm sure.

    Plus the octane may not have been up to snuff either. Stale gas, or maybe he didn't use 91 octane or higher grade?

  10. #10

    Join Date
    May 2010
    Location
    Toronto,Ontario
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    35
    I just did a quick search for the head gasket and according to this sit there the same.
    http://wolfiesmarineproducts.com/pol...%20kit%203.htm

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