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Thread: sx750 issues

  1. #1
    PWCToday Newbie
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    sx750 issues

    After some info please guys

    I've been given a couple of SX750 pole skis by my bro in law.
    They have been sitting for a number of years without being run.
    I have managed to get 1 going relatively easily but the other has issues.

    I've flushed the fuel tank out and removed the spark plugs. When cranking, it turns easily but the rear cylinder is pumping oil out. As in tons of it. Squirts a fountain if I don't have a rag over the hole.
    Got absolutely covered haha
    Any tips please to what could be causing this issue?

    I've had feck all experience with these. Only 2S I've had dealings with have been my MX bikes and outboards.

  2. #2
    PWCToday.com Is My Home Away From Home
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    Re: sx750 issues

    Two stroke engine -- there is normally only a small amount of oil in the engine and it doesn't have an oil sump like a 4 stroke. It probably got full of oil by some method and you just need to get it out. Turn the ski on its port side and crank it with the plugs out until it is mostly clear.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  3. #3
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    Re: sx750 issues

    Will give that a crack thanks linkman.
    It will continuously pump out oil when cranking. Must be sucking it through from the carby. Dunno why only 1 cylinder is affected though if that's where it's coming from

  4. #4
    PWCToday.com Is My Home Away From Home
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    Re: sx750 issues

    The 750sx came with oil injection from the factory. That system has a very small oil line that feeds the carb(s). It isn't capable of pumping much oil into there.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  5. #5
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    Re: sx750 issues

    IF the oil injection pump is bad oil can gravity feed through it into the carb and fill the case. Just get it all pumped out and get some fuel through that engine and itíll fire. It will smoke like a ***** when first fires too.
    Last edited by Jbat; 10-23-2017 at 10:25 PM.
    '88 & '89 650sx
    '91 X2
    '92 750sx
    '98 XL 1200 couch
    '07 Ultra LX-parting out haha

  6. #6
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    Re: sx750 issues

    Mmmm OK. I'll give your suggestion a go and see if it clears.
    Wondered how so much could end up in there.
    Thanks for you help.

    Can't wait to get these going and on the water for summer.
    We have a number of lakes nearby plus the ocean is very handy too.
    I have ridden these particular skis before and had a blast.

  7. #7
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    Re: sx750 issues

    If the oil pump is bad, and it sounds like it might be.... You can very easily blow up your engine.... Best bet is to block off the oil pump and premix 40 to 1....its a very common modification as those pumps go bad then blow up your engine.... I'd highly recommend you go to premix!

  8. #8
    PWCToday Guru scottw090's Avatar
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    Re: sx750 issues

    maybe the previous owner "fogged it real good" for storage. Yabadabadoo is right, eliminating the injection system is a good safeguard. There are many threads debating that theory. My summation is that the oil lines will fail (dry rot) long before the pump would. If the motor still has the crank case drain.... use it? 100% recommend to block that off, however.

  9. #9
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    Re: sx750 issues

    Picked up some stainless 1/8" npt bungs to block the crankcase vents. Will pull the motors out to do that. Looks next to impossible to do in place.

    The sick ski may have a crook carb. BIL now said he couldn't get fuel through. I'm getting fuel up to the carb but haven't looked further yet.
    Been trying to do some work on the trailer at the moment so it can be moved. Need to get the skis off the trailer before getting to far deep in them.

  10. #10
    Top Dog bandit88's Avatar
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    Re: sx750 issues

    With anything that has been setting for a while, and of age, I would at a minimum replace the fuel lines, rebuild the carbs, and replace the crank seals. I also highly recommend removing the oil pump on those and switch to mix.
    -95 750SXI
    -86 440 with PJS800 conversion
    -90 TS650

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