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  1. #1

    First PWC, 1994 750 SS XI. I have lots of questions where do I start.

    I bought a 1994 750 SS XI. I have been wanting a PWC for a while and I have also been wanting to learn how to do some engine work. Overall my goal is to get the engine running and then look at doing some possible upgrades.I am trying to figure out how this forum works, so thought this would be the best place to start. Ideally I'd like to have one post to ask all my questions or should I separate out the posts. I'll start here but please let me know if this should be moved.

    A little background on the Ski. It was a single owner ski that was run till 2016. Sometime in 2016 it stopped working and sat for a couple years. The owners gave the ski to a friend. The friend replaced the battery and rebuilt the carb (from a kit off eBay). He got it running had the Jetski on the water once (August 201. He said it ran fine. The ski sat for the last month. When I picked it up it the hull was full of water as the plug was left in it. We drained the water out to get the Ski in my truck and off I went. When I go home I noticed the bilge was fill of an oily sludge.

    I have spent the weekend reading as much as I can and playing with the ski. The ski doesn't run. It will start but will run for about 15 seconds then dies. After dying it becomes difficult to start. If I remove the plugs clean them off and put them back in the ski will start again. When I remove he plugs they look wet (with a bit of water not fuel) and a little oily. So I have a few theories as to what my issues are

    - Bad carb rebuild. Carb is getting either too much Oil or too much Fuel. which is why cleaning the plugs helps.
    - Bad Gas (with the hull being filled with water maybe this got into the tank somehow. The gas is only a month old)
    - Maybe water got into the carb?

    I am thinking of rebuilding the carb again. I'd like to have the skill. How do I tell if it is a CDK or CDK II? I know it's the dual Carb and I know the CDK II started in 1994 but I also know these things are not always exact as to when they switch from one version to another plus I can't be sure it's the original carb.

    Is there any reason to suspect the gas is bad (could the water in the hull have gotten into the tank)?
    Is there anything else that could be getting water into the system that I should check?

    Any other thoughts?


  2. #2
    I also wanted to add that I did a compression check and the one cylinder is 140, while the other is 120. The paint around d the 120 cylinder is black, I assume that's an issue?

  3. #3
    What a difference the correct manual makes. I originally downloaded the '93 manual but last night realised it was wrong and got the '94 manual and read the whole thing.

    I also found a few good posts which helped me figure some things out. So here are my updates.

    One thing I didn't post yesterday was that the cylinder with low compression is also black (the other side is green), so it appears to have over heated at some point.

    I have also figured out I have an oil leak. I kind've new this yesterday but was in a bit of denial. My theory is the side that over heated and has low compression has the oil leak.

    Do you think a lack of oil could be the cause of low compression?

    I am also now thinking that the water in the bilge is what is preventing the engine from running.

    So my primary concern is the water. I know water in the engine is bad. From what is have read the solution is to run the engine hard to clear is out but right now I can't get it running so that isn't an option.

    Additionally I tried to pull the block drain last night and the cable snapped.

    At the stage I think my best option is to pull the engine out and start to rebuild but I won't be able to do that until at least the weekend.

    Fun times.

  4. #4
    What a difference the correct manual makes. I originally downloaded the '93 manual but last night realised it was wrong and got the '94 manual and read the whole thing.

    I also found a few good posts which helped me figure some things out. So here are my updates.

    One thing I didn't post yesterday was that the cylinder with low compression is also black (the other side is green), so it appears to have over heated at some point.

    I have also figured out I have an oil leak. I kind've new this yesterday but was in a bit of denial. My theory is the side that over heated and has low compression has the oil leak.

    Do you think a lack of oil could be the cause of low compression?

    I am also now thinking that the water in the bilge is what is preventing the engine from running.

    So my primary concern is the water. I know water in the engine is bad. From what is have read the solution is to run the engine hard to clear is out but right now I can't get it running so that isn't an option.

    Additionally I tried to pull the block drain last night and the cable snapped.

    At the stage I think my best option is to pull the engine out and start to rebuild but I won't be able to do that until at least the weekend.

    Fun times.

  5. #5
    steve45's Avatar
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    Welcome aboard, Blamey!

    Sorry to hear about your problems. Where did the water come from? How much water was there? Does your 'Ski have a hull drain? My '93 SS Xi did not, but I installed one (pain in the ass!).

    Pull the spark plugs out and ground the wires on the grounding lugs. Place an old towel over the spark plug holes and crank the engine. If it has a bunch of water in it, it will spray everywhere. If the water has been it for more than a day or two, the crankshaft bearings are probably rusted, but you'll have to pull it to see for sure. Mine had been submerged and they got enough water out to save the crank bearings, but the counterweights had rust on them. It's still running to the best of my knowledge.

    You would probably be smart to get rid of the crankcase drain. Even when they work, they can be a source of leaks and cause the engine to run lean.

  6. #6
    No need to be sorry, I bought the ski for this purpose as I wanted to have something to fix over the winter and have never rebuilt an engine.

    I assume the water came from rain as the ski was sitting outside without a cover. The hull has a drain but the previous owner didn't remove it when he last used the ski.

    I have removed the plugs and run the engine and didn't get any water. There may been a small puff of water when I did this on Saturday but I don't remember. My concern is that there is water in the crank case. It is why I tried to pull the block drain. It's going to take me a couple days to be able to get the water out. is there anything I can do now to try protect the engine. Or should I just resign to a rebuild?

    Where do I take the block to get Bored? Any machine shop or should I take it to a specialist?

  7. #7
    steve45's Avatar
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    Well, if you didn't get any water out of the spark plug holes, you're probably in the clear. You might get some fogging oil and spray it into the carb throats while cranking the engine to give it a little more protection.

    There are some online shops that do cylinder work, or you might try your local dealer or motorcycle shop. They usually have a boring machine and know how to fit pistons to cylinders. Don't worry about that until you determine that there really is damage to the cylinders.

  8. #8
    Well next is to determine where the oil leak is coming from.

    Any way to tell if the carb is getting enough oil?

    Can I add some oil to the fuel so I can run the engine without damaging it or is too much oil bad?

  9. #9
    steve45's Avatar
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    The oil pump is on the front of the engine, it has a couple of hoses coming out that go to the carburetors. Check them for security and splits. They should probably be replaced if they haven't been changed in the last few years.

    Yes, you can run pre-mix in addition to the oil injection. Pre-mix at 50:1. This much oil will tend to foul the spark plugs if you let it idle too much, so carry spare plugs and a wrench to change them.

  10. #10
    Okay, not much time tonight so just trying to get a better sense of what is what on the drive train

    I see the oil pump, looks like it runs to the exhaust manifold.

    I think I found the oil leak. The hose clamp at the oil tank is loose and leaking. I'll tighten this tomorrow and check for other leaks. Got most of the bildge cleaned out. I am concerned that the engine hasn't been getting much oil because of this. I'll add oil to the gas to be safe for now and try bleed the pump and test that it's supplying oil.

    Thanks for the help. It's really giving me direction.

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