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Thread: 1997 Sl 780

  1. #1

    1997 Sl 780

    Hi, I am new to these forums but recognize some names from the SBT/PWC forums. Here is a quick history:

    Bought machine used about 5 seasons ago.
    Machine blew up in less than 10 mins.
    Luckily marina agreed to repair it.
    Centre cylinder was seized, bent crank.
    Marina said likely due to air in oil injection lines.
    During shipping carb cover broke.
    Drove it about 20 hours with duct tape on cover (yes I am a dumbass).
    Very wavy day, waves crashing overtop all day, machine stalled twice.
    Never ran the same. (Was thinking injested some water thru carbs?)
    Low compression Center Cylinder.
    Panicked and converted to Premix.
    Ran another day and it just got worse, barely made it back.
    No Compression center cylinder again.
    Bought a new SBT motor to replace it.
    Seems a little slower and weaker (110) compression but equal to each cylinder.
    Drove it all last season no problems.

    My question is and I kinda already know the answer, should I rebuild the carbs? This machine really doesn't have that many hours on it. 10 when I bought it plus 20 the next engine and about 20 on the SBT engine, so about 50 hours total if that.

    I am so scared of screwing up the carbs and blowing another engine or leaving the carbs and blowing another engine. I am not that mechanical and money is an issue. I looked in the Stickeys but could not find detailed instructions on the carb rebuilds. Any links would be appreciated. Also which carbs does this ski have?

    Thanks for all your help.
    'ZiGz


  2. #2
    Moderator beerdart's Avatar
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    Zig Welocome to the Hulk. Enjoy your stay. Thanks For Flying Green Hulk Airways....

    Here is the mikuni manual
    http://www.greenhulk.net/forums/show...98&postcount=7

    Also read thru the tech section.
    http://www.greenhulk.net/forums/forumdisplay.php?f=101

  3. #3
    ph2ocraft's Avatar
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    Hey ZIG, I'd also like to say WELCOME to the Green Hulk Forums!!!

    If you're going to take the time and go through the carbs, take the time to replace the fuel lines and rebuild that pump as well. They are simple and inexpensive, well worth the headache savings later.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the hulk. I would say it's not the amount of hours the carbs are used, but more of the years gas has been sitting in them varnishing them up. The 780 uses Mikuni Super BN 38mm carbs. One rebuild kit will do 1 carb, so you will need 3 kits. It's recommended to use only Mikuni brand kits. You should buy new needles and seats, that are not included in the kits. Kits will run you close to $120, needles and seats almost $60, new fuel hose and fuel pump rebuild around $35. So for a little over $200, you'll have reliabilty, and piece of mind.

  5. #5
    ph2ocraft's Avatar
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    Quote Originally Posted by xlint89 View Post
    Welcome to the hulk. I would say it's not the amount of hours the carbs are used, but more of the years gas has been sitting in them varnishing them up. The 780 uses Mikuni Super BN 38mm carbs. One rebuild kit will do 1 carb, so you will need 3 kits. It's recommended to use only Mikuni brand kits. You should buy new needles and seats, that are not included in the kits. Kits will run you close to $120, needles and seats almost $60, new fuel hose and fuel pump rebuild around $35. So for a little over $200, you'll have reliabilty, and piece of mind.
    Nicely stated!!

  6. #6
    Thanks for the warm welcome and quick replies.

    Suggestions on where to order these parts in Canada?

  7. #7
    ph2ocraft's Avatar
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    That I don't know.
    Have you checked to see if any of these guys will ship out of country?

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Pretty common parts, try a web search. Or I'm sure most suppliers will deal with Canada.

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