T509 Running Rough

Discussion in 'Technical Help' started by budgie955, Jul 5, 2019.

  1. budgie955

    budgie955 New Member

    Jul 5, 2019
    0
    1
    Sheffield
    #1 budgie955, Jul 5, 2019
    Hi
    My Speed triple is running dog rough, spits back through airbox, and hangs on to the revs. My local shop replaced all tthe airbox hoses, it ran great for 50 mile now the problem is back.

    Any ideas please as to the cause?

    Cheers
    Budgie
     
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  2. Vulpes

    Vulpes Confused Member

    Mar 14, 2018
    19,590
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    #2 Vulpes, Jul 5, 2019
    Last edited: Jul 5, 2019
    Hi and welcome. Can't help you, but someone knowledgeable wil undoubtedly be along shortly.
     
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  3. joe mc donald

    joe mc donald Joe
    Subscriber

    Dec 26, 2014
    15,620
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    slough / burnham
    #3 joe mc donald, Jul 5, 2019
    budgie955.
    Welcome to the family. We need some more info to be of any help. Tell us about the beastie. service, mileage, has it been laid up any length of time. Any recent mods or in fact any mods. And I am not referring to scooters before anyone gets carried away. Picture of the steed would be nice.
    Regards
    Joe
     
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  4. budgie955

    budgie955 New Member

    Jul 5, 2019
    0
    1
    Sheffield
    #4 budgie955, Jul 5, 2019
    Not been stood, no service history, 25000 miles, previous owner not had any problems. Local shop replaced the air box rubbers as they were perished. Thought that cured it as it ran fine for a while, took it for MOT today, ran fine going, dog rough coming back.
     
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  5. D'Ecosse

    D'Ecosse Senior Member

    Jun 23, 2019
    271
    113
    CA, USA
    #5 D'Ecosse, Jul 5, 2019
    WHICH Airbox rubbers?
    The common failure is oft he hoses which are between the IACV (Idle Air Control Valve) and the Throttle Bodies - those do not actually connect to the airbox in any way, but not sure if that is what you meant. "
    You can replace those with 6mm Silicone hose - the OEM ones have a check valve in the middle, it is not necessary to re-install these.
    And then check the throttle balance
     
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  6. budgie955

    budgie955 New Member

    Jul 5, 2019
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    Sheffield
    #6 budgie955, Jul 5, 2019
    I am under the impression these were done at the shop, will find out. If these have been replaced , whats next ?
     
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  7. D'Ecosse

    D'Ecosse Senior Member

    Jun 23, 2019
    271
    113
    CA, USA
    #7 D'Ecosse, Jul 5, 2019
    Use of the term "airbox rubbers" is what confused here.

    Rough is one thing - if the idle speed is high then it's definitely an air leak.
     
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  8. budgie955

    budgie955 New Member

    Jul 5, 2019
    0
    1
    Sheffield
    #8 budgie955, Jul 5, 2019
    You rev it and it the revs take time to drop, but its intermittant.
     
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  9. David Cooper

    David Cooper Triumph Rocketeer.
    Subscriber

    Jun 23, 2018
    28,858
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    #9 David Cooper, Jul 5, 2019
    Hello and welcome to the forum Budgie.

    98636c6ee64925a19858f8a491d300d2.gif
     
    • Like Like x 1
  10. joe mc donald

    joe mc donald Joe
    Subscriber

    Dec 26, 2014
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    #10 joe mc donald, Jul 5, 2019
    Budgie955.
    Well it seems to be the air box in some way. what you need to do now is check it completely for leaks or trapped pipes. Also check the breather tube to the petrol tank and fuel flow. Check your cables and mechanism is all free and working. Balance the carbs. Check your air filter is clean and free flowing.
    Regards
    Joe.
     
  11. freck

    freck Elite Member

    May 4, 2017
    1,721
    750
    Preston, Lancs, UK
    #11 freck, Jul 5, 2019
    This sounds like you’ve got a sticking throttle cable, or it’s routed incorrectly.
    Could also be that there’s been something trapped against the cable or it’s mechanism when putting the airbox or tank back on; it’s a bit of a squeeze in there. ;)
    If you’ve no service history, it’ll be worth doing a comprehensive service including a throttle body balance.
     
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  12. budgie955

    budgie955 New Member

    Jul 5, 2019
    0
    1
    Sheffield
    #12 budgie955, Jul 6, 2019
    cable is fine and not sticking, going to have to look myself at this. Any tips on removing the airbox ?
     
  13. sprintdave

    sprintdave Nurse, think it's time for his medications.

    May 25, 2014
    1,682
    750
    Birmingham
    #13 sprintdave, Jul 6, 2019


    Watch from approx 5 min 50 seconds, ignore the fuel filter bit. Hope this helps
     
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  14. budgie955

    budgie955 New Member

    Jul 5, 2019
    0
    1
    Sheffield
    #14 budgie955, Jul 7, 2019
    Very useful , thanks, my local friendly mechanic says the stepper motor is the likely culprit, likely sticking or seized.
     
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