Hanging Idle

Discussion in 'Triumph General Discussion' started by MJA, Oct 18, 2024.

  1. MJA

    MJA New Member

    May 26, 2023
    1
    3
    Preston
    Hi everyone

    I’m having a problem with my triumph street scrambler 2021 model

    I can’t ride comfortably at slow speeds say in town etc.

    The problem is that when you release the throttle the revs only drop to around 1450 which makes a run on. As soon as you pull the clutch in the revs drop to normal around 1100. I’ve taken it to youles triumph who said it’s normal. I’ve taken it to a mechanic who said nothing is showing up on the computer. It’s so annoying I could even take my hand off the throttle in 2 nd gear and it rides like cruise control. I want the Revs to drop to an acceptable level whether it’s in gear or not. That’s how all my bikes have worked over the years. I might have to sell it if o can’t fix it.Anyone else have the same problem cheers MJ
     
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  2. joe mc donald

    Subscriber

    Dec 26, 2014
    14,435
    1,000
    slough / burnham
    @MJA I can't see why someone can't drop the revs for you. Surely easy enough to do. Have you insisted to them that you want lower revs
     
  3. MJA

    MJA New Member

    May 26, 2023
    1
    3
    Preston
    Yeah told them the problem but triumph just say that’s what they are suppose to do to stop them stalling.
     
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  4. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,283
    800
    Yorkshire
    That's not normal IMO. I've had a 2020 and a 2022 SS and neither of them did that. I'm pretty sure the idle is controlled by the ECU and is not manually adjustable. I used Dealertool for servicing and "Target Idle Speed" is displayed on one of the functions but I can't remember if it's actually adjustable. I would imagine the diagnostics that dealers use will have the option to adjust the speed.
     
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  5. MJA

    MJA New Member

    May 26, 2023
    1
    3
    Preston
    thanks for the info. Interesting that neither of yours did it. I should probably take it back again. Lost faith in the dealership.
     
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  6. learningtofly

    learningtofly He’s not the Messiah, he’s a very naughty boy!
    Subscriber

    Sep 25, 2018
    2,134
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    Hertfordshire
    If the revs drop to 1100 with the clutch engaged then it’s surely not the idle that needs adjusting.
     
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  7. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,283
    800
    Yorkshire
    With modern EFI vehicles the idle is controlled dynamically by the ECU using data from numerous sensors, one of which being the clutch switch, rather than being pegged at a certain value. Bring back carbs I say!:joy:
     
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  8. learningtofly

    learningtofly He’s not the Messiah, he’s a very naughty boy!
    Subscriber

    Sep 25, 2018
    2,134
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    Thank you. Who'd have thunk it.
     
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  9. Mini

    Mini Member

    Jun 28, 2022
    72
    18
    Australia
    Sounds like you're getting air in the system, check to see if any hoses have fallen off, no cracks, finally spray some WD40 or something similar around the throttle bodies, it worked on an old daytona I had, who knows its worth a shot. Let us know how you go. M
     
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  10. Cycleman

    Cycleman New Member

    May 17, 2024
    3
    3
    Alberta, Canada
    On carbed bikes a hanging idle was usually caused by an air leak or too lean mixture at idle. I'm not sure there is anything wrong with your bike.
    The way I see it as you are coming to a stop the bike is keeping the revs as its in gear and under load. As soon as you apply the clutch, the engine is no longer under load and the revs drop to a normal idle. On my 23 ST900 the idle is around 1000 rpm. Yours might very well be 1100, would depend on bike model I guess.
    So if you are doing any slow speed riding, you normally use the clutch, throttle and rear brake all together to control your forward progress. If the bike works fine when doing this, there isn't anything wrong. Not sure I'm really making any sense.
     
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  11. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    357
    113
    Downham Market, Norfolk
    Modern Triumph's certainly idle faster than Triumph's of old. For reference my 2019 Speed Triple idles at 1300rpm.
     
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  12. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,283
    800
    Yorkshire
    That seems abnormally high. Both my Scramblers, 900 & 1200 idle around 1100, as does the ZZR. The FE, on the other hand is set to around 1600, big single, light flywheel.
     
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  13. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    357
    113
    Downham Market, Norfolk
    Modern Triumph's certainly idle faster than Triumph's of old. For reference my 2019 Speed Triple idles at 1300rpm.
    Can't say it's ever caused any issues or been a cause for concern. Never crossed my mind that it could be idling too fast. 1300rpm is what is specified in the official Triumph online service manual and works for me.
     
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