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  1. #1
    Flower girl's Avatar
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    Msx 140 runs great at 6500 -6600 rpms and sputters

    Does anybody has a idea goes back to 4600 rpm or so and
    than I let of the throttle and she will go back to 6600 rpms
    this only happens when the machine is warm when cool I can go
    10-15 minutes full power
    is it the air temp sensor ???
    Please let me know thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    How much do you need to release the throttle before you can squeeze again for full power? Do you have to let off completely, or just relax your throttle finger a bit?

    Any warning messages or red light?

    Does the engine simply slow down and maintain a steady but slower speed, or does it surge and miss?

  3. #3
    Flower girl's Avatar
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    Have to let it go all the way no lights and lost
    Of power when it sputters

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Flower girl View Post
    Have to let it go all the way no lights and lost
    Of power when it sputters
    Unplug the reverse sensing switch under the front. If that switch is being jiggled and momentarily signaling to the EMM that reverse has engaged, the EMM will then restrict RPM to 3500 until the throttle is released.

  5. #5
    Flower girl's Avatar
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    Will try thanks

  6. #6
    Flower girl's Avatar
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    ?? Leave it unplugged or unplug and than plug it back in

  7. #7

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    Leave it unplugged.
    Have you checked your sparkplugs? They might be broken or worn out. Mabye change to coolder plugs will help.

  8. #8
    Flower girl's Avatar
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    Plugs are new 25 hours ago

  9. #9

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    Ok. Mine worked similar to what you described when my plugs were to hot. It worked fine until the engine was hot, then it started to hesitate and didnt want to rev as much. Changed to coolder plugs and the problem went away. Just a thought.

  10. #10
    Flower girl's Avatar
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    I think you only can use one specific plug
    For msx 140 which I did
    But thanks anyway

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