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  1. #1
    PWCToday Newbie
    Join Date
    Jul 2008
    Location
    Cincinnati
    Posts
    18

    ultra 150 no power

    I have a 99 ultra 150. I just rebuilt the motor and have about 110 psi on each cylinder. While going through the SBT break-in process for rebuilds using 50:1 premix along with the oil injection, it was apparent the ski would not go over 4000 rpm. it gets there at about 1/4 throttle and never goes higher. It really bogs and misses...especially when taking off. I put new plugs in prior to starting step 3 of the break-in as per the procedure.....no change. I filled the gas tank back up with 93 octane and fuel system cleaner...no change. The plugs are always wet with oil when I take them out. also, coincindentally, the speedometer quit working...any relationship?


    It acts like fouled plugs, but I don't know why the new plugs did not help.


    Any help would be appreciated

    Thanks

  2. #2
    PWCToday Regular
    Join Date
    Apr 2007
    Location
    Tarpon Springs, FL---Queens,NY
    Posts
    66

    Re: ultra 150 no power

    is it definitely still firing on all 3?

  3. #3
    PWCToday Newbie
    Join Date
    Jul 2008
    Location
    Cincinnati
    Posts
    18

    Re: ultra 150 no power

    it sure seems like it except for when it misses....which is nearly all the time it is under a load. It idels great. when no load it snaps right up to 8000 rpm.

  4. #4
    PWCToday Regular
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    44
    Posts
    143

    Re: ultra 150 no power

    Have you tried trimming your plug wires?

    By the way, did you ever solve the issue of why your previous motor let go. Are you sure you aren't running lean or that you don't have a carb problem?

  5. #5
    PWCToday Newbie
    Join Date
    Jul 2008
    Location
    Cincinnati
    Posts
    18

    Re: ultra 150 no power

    have not tried trimming the plug wires. Is this difficult?

    The other had a crack in the oil line to #2 cyl. lost lube. don't know about carb problem. it idles great and runs well with no load

  6. #6
    PWCToday Regular
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    44
    Posts
    143

    Re: ultra 150 no power

    No, it's really simple. To trim the wires you cut off the zip ties on the plug boots and pull the boot off of the wire (twist as you pull it off). trim 1/4 inch or so off of the end of the plug wire and reinstall the plug boot (once again twisting the boot as you put the wire back into the boot (1/2 of a twist will do). There is a spike inside of the plug boot that pierces into the center of the wire. Over time water can corrode that connection and cause a weak spark. After you have reinstalled the wires into the boots install new zip ties on them to keep them in place.
    Last edited by mikecox1; 06-06-2009 at 11:05 PM.

  7. #7
    PWCToday Regular
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    44
    Posts
    143

    Re: ultra 150 no power

    Also, while not 100% required, it would be ideal to put a little dielectric grease on the end of the newly cut wires before inserting them into the plug boot to stave off corrosion and repell water.
    Last edited by mikecox1; 06-06-2009 at 11:15 PM.

  8. #8
    PWCToday Newbie
    Join Date
    Jul 2008
    Location
    Cincinnati
    Posts
    18

    Re: ultra 150 no power

    thanks,
    I'll try trimming the plug wires

  9. #9
    PWCToday Newbie
    Join Date
    Jul 2008
    Location
    Cincinnati
    Posts
    18

    Re: ultra 150 no power

    NO LUCK! I trimmed the wires put it back in the water.....same thing??????

  10. #10

    Re: ultra 150 no power

    Who built the motor?

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