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  1. #1

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    To De-carb or not to De-carb......

    that is the question. Hey guys, I have a 99 xl1200ltd with about 84 hours. Runs good but I'm wondering about doing a de-carb. This is a pretty normal thing for outboards which I do but wasn't sure about the ski. Some recommend sea foam but i wasn't sure in this case. If anyone could provide some info I would appreciate it. I did some searches but not much coming up......Thanks!!!


  2. #2
    Moderator RX951's Avatar
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    Here is information on a carb rebuild.

    http://www.hydrotoys.com/gpr/tuners/...orAssembly.pdf

    and

    carb removal
    http://www.cajundude.com/carbremoval.htm

    carb rejetting
    http://www.cajundude.com/carbrejet.htm

    other how tos for the 66V motor
    http://www.cajundude.com/techpagehome.htm

    common carb issues
    http://greenhulk.net/forums/showthread.php?t=62751

    also please take the time to dowload a service manual for your ski. do a search for Yamaha Service Manual or look in my signature.

    also, feel free to contact forum member OsideBill. He is one of our carb gurus He has some how-to tutorials also.

  3. #3
    Bartlesville OK syclonedriver's Avatar
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    carb rebuild or de-carbon

    I'm not sure what your asking. De-carbon (as in internal engine cleaning)or carb rebuild?

  4. #4
    If your not doing something, its hard to screw up. stlouisramsfan's Avatar
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    Quote Originally Posted by syclonedriver View Post
    I'm not sure what your asking. De-carbon (as in internal engine cleaning)or carb rebuild?
    + 1

  5. #5

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    De-carbing as in burning the carbon that is in the cylinders, not a rebuild. Sea Foam is a common product but I wasn't sure about waverunners

    http://www.seafoamsales.com/motorTuneUpTechGas.htm

  6. #6
    Moderator RX951's Avatar
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    sorry for the misunderstanding. I read de-carb and immeiately went in CARB mode

    hopefully somebody has experience in this. As for PWC, I have not heard of this. I do know that it is easy to remove the cylinder head to get a view of the tops of the piston to see the 'pistonwash' of your cylinder. Now different things can affect pistonwash. Lean jetting can do this also.

    As for your XLT 66V motor, I would do a compression check to get a baseline of your motor. Probably would not hurt you to remove your carbs and clean the internal filters if they have never been off. Especially if this is a stock ski with many hours on it.
    common carb issues
    http://greenhulk.net/forums/showthread.php?t=62751

    *As for a carbon burn....uhm.....I have heard of this done on boat engines using a special conditioner. I think they raise the rpm while this conditioner is added to help assist the burn. I have heard of people using marvel mystery oil or Mercury Marine conditoner too. I'm sure there is info on the net.

    Now for your PWC, I am not sure. Never heard it done here. Maybe somebody has..

    I've heard of it being done by old skool mechanics in the past on automobile engines where they actually do a slow drip of water down the carb to create a steam out effect to remove carbon. I would not do this in your case. Just giving you an example of where I heard this before.

  7. #7
    BORN TO FISH NOT CATCH
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    the best way to de carb is to mist water down the intake

    but u can use the seafoam method
    i did a post here
    http://www.switchbait.com/forums/showthread.php?t=159

  8. #8

    Join Date
    Aug 2008
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    Tuckerton, NJ
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    Thanks all for your input. As I said the ski runs fine but I feel like this wouldn't hurt and might even restore some power. That'll be a on my list of things to do come this spring.

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