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  1. #1

    ultra 150 only running 20 mph in water

    I have a 2000 ultra 150 that is running 20 mph max in the water. I replaced all spark plugs and nothing happens. It seems like when you unplug the 2 of 3 the spark plugs when it is running the motor changes idle and 1 of than nothing happens. the 1 nothing happens has no oil on the plug. Can anyone point me in the right direction. Thanks

  2. #2
    thesepaperwings's Avatar
    Join Date
    May 2007
    South East Kansas
    Sounds like your running on two cyl. You need to do a compression test and test for spark. If compression is low then pull the heads and look at your pistons. Let me know what you see.

  3. #3
    how do you test for spark?

  4. #4
    axgrider73's Avatar
    Join Date
    Feb 2007
    Southeast Ohio
    Welcome to the Green Hulk Forums!!

    To test for spark, just pull the plug and ground it to the engine and crank it. You should see a blue spark. Just make sure that there are no gas fumes present while testing.

    If you don't have a compression gauge, you can get one for around $20 at most automotive supplyy stores. I am guessing that you have lost a piston.

  5. #5
    Skibumtx's Avatar
    Join Date
    Sep 2006
    Huntsville, AL
    Axgrinder is right, check the compression, bet you blew a cylinder. You can also check and see if the cylinder is warm when runnning, if not you have a problem. Check below the engine and see if there are any metal fragments, if so, you have punched a hole in the bottom of the crankcase. This usually occurs when your oil line srings a leak an you end up with no oil in that cylinder.

    Let us know what you find.

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