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  1. #1

    Will not accelerate! Help!

    Newbie to this. Having some problems after buying two Polaris jet skis. This was our first time getting in water after buying both jet skis. '95 SLT 750 when we first bought last month was cranked up and started with no problem. When we tried to start it on the water today, it would keep turning over but would not fire. We tried the choke, but it wouldn't help any. It was supposed to have been summerized before it was sold to us. We would like to test it out of water, but we cannot figure out where to put the water hose to the motor? We have the connector. The other jet ski '94 SL750 was difficult to start. I had to choke it multiple times before it started. It ran okay until I let off the gas and it died. It would do it every time I let off gas. With one person on it, it accelerated good. Whenever my wife was on there with me, we rode for 20 minutes and then it all of a sudden began to get slower. I could accelerate, but it wouldn't go over 10 mph. Can water in the hull make it slow down and could extra weight on the jet ski cause this? Any suggestions or help would greatly be appreciated. Thanks!!


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Greenhulk! Possibly consider getting primers ($35 per ski)for the skis, instead of using chokes. It makes it MUCH easier to start. And a little starting fluid never hurts. When the engine gets slower, that's usually not a good sign. Can you do a compression test on the ski?

  3. #3
    ph2ocraft's Avatar
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    First I'd like to say WELCOME to the Green Hulk Forums!!!

    I hate to sound like a broken record but have you tested for compression?
    Do the ski's have new fuel line and updated fuel valves?
    With the age of the ski's it extremely important to replace the line, it's probably swelling and or kinked over due to age and/or gravity.
    I always like to know engine compression first as if it's low, you'll never get them running correctly.
    How much water is in the hull?
    Did you have the bilge plugs in?
    You can leave the boats strapped to the tgrailer and lower them into the water so the pump is in the water and able to draw water.
    Run the engine and check for leaks. Be sure to accelerate as some leaks won't show up at idle.

  4. #4
    Moderator RX951's Avatar
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    Welcome to the Forum !

  5. #5

    Couple of Questions

    How do you perform a compression test? The engine sounds like it is working properly, but it is just not accelerating. I'm new to all this, so .... There was probably about 2 or 3 gallons in the hull. The plug was in, but it may not have been tightened all the way.

  6. #6
    ph2ocraft's Avatar
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    Verify where the water is entering the hull before you do anything else.
    You need a compression gauge,
    then remove the plugs,
    screw the gauge into the domes (spark plug holes),
    ground the wires,
    crank and record compression numbers for each cylinder.

  7. #7

    Compression Question

    What is a good compression reading? What is bad?

  8. #8
    ph2ocraft's Avatar
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    Good is less that 10% variance between cylinders

    examples
    125-123-125=good
    125-123-75=bad

  9. #9
    SeaLion's Avatar
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    Also don't use starter fluid to fire it up. It will wash the oil off the cylinder walls and you lose critical lubrication. Check the compression first like recommended. Someone could have put a too tall impeller in it too and that will load the engine and perform poorly with 2 people. Check the compression first though. Also when checking compression per ph2o's post, make sure to hold the throttle wide open as this gives a more accurate reading.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Starting fluid is a no-no? I didn't know that. I always thought quicker start up is better than longer cranking friction.

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