The Return Of The Snatchy Throttle with Momentary Power Loss
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The Return Of The Snatchy Throttle with Momentary Power Loss

This is a discussion on The Return Of The Snatchy Throttle with Momentary Power Loss within the MT-09 Forum forums, part of the Yamaha MT-09 category; MT-09 problem. 2014, 40,000 km, all standard except for Kev's O2 sensor biaser. Misses occasionally. Momentarily loses power at small throttle openings when pulling away. ...

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Thread: The Return Of The Snatchy Throttle with Momentary Power Loss

  1. #1
    Member Jim_Royle's Avatar
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    The Return Of The Snatchy Throttle with Momentary Power Loss

    MT-09 problem.

    2014, 40,000 km, all standard except for Kev's O2 sensor biaser. Misses occasionally. Momentarily loses power at small throttle openings when pulling away. Generally jerky and not fun to ride in town. Find myself going in to B mode so it doesn't annoy me too much. It reminds me of how it was before the recall ecu flash .

    I should add, just had the full 40k service at Yam City. Had several tanks of fuel through it. Just crept up on me. Came to really notice it after the other half got her lams 07 and I started buzzing about on that.

    Its slowly getting worse.

    Went to the Yam dealer on Saturday morning. He had a ride and couldn't get the fault to happen. The ecu had no fault codes. He claims that means nothing is wrong. I am not convinced. Has anyone had a TPS act up without throwing a fault code? Can we view the TPS numbers via the dash?

    I would assume a failure of Kev's O2 sensor biaser is very unlikely and would not cause momentary power loss.

    What does the hive mind think?

  2. #2
    Senior Member peabrain's Avatar
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    you could try temp unplugging the O2 mod and let the bike run stock to test. and to be shure you could try disconnect the battery to let the ECU go back to basic.

    otherwise try checking the basic stuff around the bike (take your time check things right)

    vacuum leaks around intake
    fuel line kinks and shrinkage
    spark plugs
    check the plug at the throttle sensor
    all ground wires at fastened
    ETC

  3. #3
    Junior Member delete's Avatar
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    Just some tip about the APS :
    https://www.tracer900.net/topic/4389...ps-adjustment/
    It's about a Tracer/FJ09, but that's practically the same engine.
    I don't think it would cause a complete loss of enginepower, but i'm not knowledgeable enough.

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    Senior Member abe57's Avatar
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    You may look at this ..worth a try.... https://www.fz09.org/forum/34-yamaha...ds-solved.html
    King-Of-Bee's

  6. #5
    Senior Member Steve H's Avatar
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    ^WHS...easy fix too....hope its this.
    Smoke me a kipper I'll be home in time for breakfast

  7. #6
    Senior Member violetpop's Avatar
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    Quote Originally Posted by abe57 View Post
    You may look at this ..worth a try.... https://www.fz09.org/forum/34-yamaha...ds-solved.html
    My bike has started to do this too.. Its almost like a small stutter when you get back on the throttle and only when using the throttle gently. If i m in the mountains its still perfect.

    Thanks for the link.
    abe57 likes this.

  8. #7
    Member Jim_Royle's Avatar
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    Thanks for your replies.

    A strange thing happened. I was out riding in the rain and the next day the problem had gone. This prompted me to have a look inside the O2 connector. It's a prick to get off but it looked good inside. I gave it a squirt with contact cleaner and put it back together. Next I'll take a look at the TPS connections.

  9. #8
    Member Jim_Royle's Avatar
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    Quote Originally Posted by peabrain View Post
    you could try temp unplugging the O2 mod and let the bike run stock to test. and to be shure you could try disconnect the battery to let the ECU go back to basic.

    otherwise try checking the basic stuff around the bike (take your time check things right)

    vacuum leaks around intake
    fuel line kinks and shrinkage
    spark plugs
    check the plug at the throttle sensor
    all ground wires at fastened
    ETC
    I have removed the O2 mod without disonnecting the battery. After 250 kilometers the problem is worse. Can an O2 sensor go inaccurate and send the bike lean? The mod reduces the problem

  10. #9
    Senior Member peabrain's Avatar
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    could you have an air leak some where?

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