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Thread: 2003 STX-R

  1. #1
    DILTS's Avatar
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    2003 STX-R

    Sitting around trying to figure out how i can squeeze about 3 more MPH out of my STXR. Anyone got any suggestions? I really don't want to do any carbs, but have tossed around the idea of heads for about a year now. Heads, CDI ??????? My wife couldn't keep up this last weekend and she said "that's it make it faster to keep up with the Ultra's. So i have permission to make her ski faster. I guess I need to act on this while it's still fresh on her mind.
    Thanks


  2. #2
    steve45's Avatar
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    The biggest bang for the buck is a better impeller.

    Higher compression heads means high octane fuel.

  3. #3
    DILTS's Avatar
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    I guess I should have said. I have changed the impellor and have always run 93 octane. I have also put on the R&D rideplate, a 15F exit and steering nozzle.

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    an ultra motor?


    Sean

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    jonny5's Avatar
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    Have you gps'ed it yet ...need numbers to see what might be realisitc.

  6. #6
    DILTS's Avatar
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    62.3 is what I am getting out of her. I would like to get 65 and I would be happy

  7. #7
    Do the STX-Rs have the temp sensor you can short out for 3 degree timing advance?

  8. #8
    DILTS's Avatar
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    Yes it does. I don't know anything about this can you give some details?

  9. #9
    Kawasaki uses a temp sensor to advance the timing on their ski's when the temperatures increase inside the hull to gain back performance lost due to heat. At a 150 degrees in the hull they advance the timing by 3 degrees... You can wire in a 470 ohm resistor or you can just tie the two wires together which would equal 0 ohms... Anything under 470 ohms will give you the 3 degrees.

    My ski out of the water idles at about 1500 on the stock tach when you short the sensor wire out the rpms jump up to 2000.

    This has worked fine on my stock ski's but I'm about to test it on my level 1.5 ski this weekend... GroupK recommends doing this running a set of high compression heads so I doubt I'll see an issue.

  10. #10
    captainoverspray's Avatar
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    Here is a good right up on the resistor mod. http://ultra150.yuku.com/forum/viewtopic/id/2170

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