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  1. #1
    JKR1300's Avatar
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    UMI Steering on a GPR

    The instructions for the UMI steering system has the following statement:
    "UMI steering systems are not designed to be used on boats using off throttle steering option. UMI Racing does not recommend the use of our steering system on any boat that has off throttle steering system disabled.
    We do not supply any instructions what so ever that instruct the installation of a UMI steering system onto a boat with this feature."
    I guess that's why it is sold as a system for the GPR1200, not the 1300's which all have the off throttle steering option.

    I personally don't care if this is system becomes disabled.
    My question: how do you disable the off throttle steering system?
    Do I just unplug the electrical connector on the OEM steering shaft?
    Or do I remove the sensor from the shaft & keep it hooked up?


  2. #2

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    Quote Originally Posted by JKR1300 View Post
    The instructions for the UMI steering system has the following statement:
    "UMI steering systems are not designed to be used on boats using off throttle steering option. UMI Racing does not recommend the use of our steering system on any boat that has off throttle steering system disabled.
    We do not supply any instructions what so ever that instruct the installation of a UMI steering system onto a boat with this feature."
    I guess that's why it is sold as a system for the GPR1200, not the 1300's which all have the off throttle steering option.

    I personally don't care if this is system becomes disabled.
    My question: how do you disable the off throttle steering system?
    Do I just unplug the electrical connector on the OEM steering shaft?
    Or do I remove the sensor from the shaft & keep it hooked up?

    I would just unplug the electrical connector. I have the umis on my 07 - i have no clue why you wouldnt be able to use them. Has nothing to do with it.

  3. #3

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    UMI has to make that statement because Yamaha (and the other manufacuturers) consider off-throttle steering to be a safety issue. If UMI were to provide instructions on how to disable the safety feature and someone had an accident, then UMI would be liable.

    I confess to not knowing exactly how the Yamaha OFS works but the basics should be - turn the handlebars with no throttle input and the ski will rev slightly to allow the ski to turn.

    Disconnect the connector and operate the ski in the water. If it doesn't cause any glaring alarms/malfuctions, then you can install the UMI system and leave it disconnected.

    If disconnecting it creates issues, then you'll need to look at the OFS to see how it works with the stock steering system and figure out a way to leave the connectors connected without affecting the sensors..

    Jcorallo - do you have the complete system or just the bars? If you have the complete system, how did you bypass the OFS?

  4. #4

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    If its a 2003 or 2004 ski then its not to difficult to fabricate a couple of bracket to fix the OTS to the UMI set up.

    Some pics of the finished set up.

    I will see if I can get a pic of inside
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  5. #5
    JKR1300's Avatar
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    I do know the OTS system will NOT work with the UMI steering system

  6. #6
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    Kevski, thats a stunning setup.

    What make and where did you get those grips from.

  7. #7

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    Quote Originally Posted by spaceman View Post
    Kevski, thats a stunning setup.

    What make and where did you get those grips from.
    From a MB shop they have BBB marked on them

    http://www.amazon.com/BBB-Bicycle-Ha...1932338&sr=1-4


    "I do know the OTS system will NOT work with the UMI steering system"

    Yes it will, just make up a couple of brackets, see pic and only took 30 mins to make up.

    Useless facility though
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  8. #8
    JKR1300's Avatar
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    Talked to Riva tech today - OTS will not work with the UMI - there are no magnetic pick-ups on UMI steering head which would be picked up by the sensor. You can zip-tie it or make a bracket to attach the sensor to the UMI steering, but it is a non-functioning system.
    They suggest to just tie it up anywhere. Plug to the sensor must be left on or system will pick up error code.

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