Need Help Identifying Loose Tubes

Discussion in 'Technical Help' started by Tim - Sprint ST 1050, Sep 25, 2025.

  1. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    #1 Tim - Sprint ST 1050, Sep 25, 2025
    Last edited: Sep 25, 2025
    Hey I'm really hoping one of you can help me, I was out riding and my bike spluttered and lost power, it has been recovered to my house and after inspecting it there were 3 tubes that were loose, yes 3 :D, there is a larger one with a twisted end and a blue clip on that looks like it should clip onto something but the other end is bunged up with a rounded piece of pipe (it's pictured but looks a little like an ear plug in shape) so I can't see how it would be able to do anything even if it was connected but it was sitting right above the small filter so thought they might have been attached because the pipe was sitting just above the check valve so I attached it as you see in the pic tho would be useless anyway as its bunged one end and from what I have read since in here and other forums it seems to be a one way valve from a breather valve on the fuel tank so I took the tank off and there are no pipes attached which is when I found the other one laying on the engine so does anyone recognise where the fatter pipe (the one with the twisted end and blue clip) goes or which spigot the thin pipe with the valve goes onto also one of the thin pipes was below the filter and I only found one other thin pipe which I'm assuming is the other end as it's too short to be the fuel overflow so if there is supposed to be 2 pipes coming from the tank then I'm guessing g one must be missing, sorry for thr long story but I'm trying to give as much detail as possible so someone can help get my baby back on the road

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  2. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    I forgot to add I also found this almost like a stretchy circular spring sitting in my engine under the tank too

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  3. joe mc donald

    Subscriber

    Dec 26, 2014
    15,370
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    slough / burnham
    @Tim - Sprint ST 1050 Welcome to the family. I would imagine that tube comes from the air box or rad. The spring i would say is from a manifold rubber or again airbox. Hopefully one of the wise ones will be along soon to help you out. Do you have a reserve tank as that third pipe may live there.
     
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  4. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    636
    243
    Norfolk
    The pipe with the blue clip and plugged end is the airbox drain and should be connected to the underside of the airbox. There should be nothing to drain from the airbox unless there is an issue hence the plug to seal it. During a service I would remove the plug to confirm that nothing drains out. The tank should have 2 vent pipes pushed onto spigots on the underside of the tank. One is to drain water from around the filler cap and the other is the tank vent which has a rollover valve to prevent fuel spillage if the bike ends up on it's side. The circular spring is one of three that should secure the rubber trumpets from the airbox to the throttle bodies. It might be worth checking that the vent pipe inside the tank is not blocked and causing fuel starvation. Poke and twist a thin flexible cable through from the top and it should pop out of the other end. Fuel starvation causes a vacuum in the tank and a hiss will be heard when the filler cap is opened.
     
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  5. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Thanks appriciate the welcome I will look at this thanks
     
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  6. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    #6 Tim - Sprint ST 1050, Sep 27, 2025 at 2:57 AM
    Last edited: Sep 27, 2025 at 11:05 AM
    Ahh wow you really know your stuff thankyou I will check this tomorrow and see if I can find it's home, can I also ask is it worth getting g rid of the one way valve as a few forums I have read have sugested or should I keep it (it's currently operational as far as I know as its freely moving) also is there any specific type or diameter of pipe to replace he fuel pipes because one of them seems to be missing :weary_face:

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  7. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    #7 Tim - Sprint ST 1050, Sep 27, 2025 at 11:03 PM
    Last edited: Sep 27, 2025 at 11:20 PM
    OK thankyou I now have new hose coming and have re seated the spring ring and know the location of the larger hose, now I just need to find something thin and flexible to check the pipe with (any ideas?) and that should show me which fuel hose to put on which spigot, also I know where the water drain hole is round the rim but where is the overflow hole?
     
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  8. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    636
    243
    Norfolk
    I use a bicycle inner brake cable to clean out the pipe. Get the thinnest one available as it will go around the bends easier and rotate it as you push it through. The vent hole is usually a short spigot that the fuel cap seals around when the cap is closed.
     
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  9. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Ok thankyou so much for all your help, really appreciate it amazing help :)
     
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  10. joe mc donald

    Subscriber

    Dec 26, 2014
    15,370
    1,000
    slough / burnham
    Really i would say don't touch any thing till you get used to the bike. The as you go along you can start modifying.
     
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  11. Zimbo32

    Zimbo32 New Member

    Aug 20, 2025
    1
    3
    Milton Keynes
    Spot on - the worrying thing is who left all these pipes off. Hopefully the circular spring was just left off and the throttle body was still connected to the pipe on the air box otherwise you could be sucking in dirty air.
     
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  12. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Yeah that's my hope tho the air filter is very dirty dispute a "full service" a couple of months ago, but the trumpet was still siting pretty flush without the spring, I am rebuilding today now I have some new tubing and more clips to use on the fuel lines so this does not repeat
     
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  13. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Thankyou to all of you for all your help and useful tips, I have now put it all back together including the missing pipes UNFORTUNATELY my bike is still suffering the same issue, I tried to take a video of the issue but couldn't upload so did it through YouTube if anyone can shad any light would be much Appriciated

    https://youtube.com/shorts/h5SR_iuiciw?si=6bdXHVdmSpeZ7rcb
     
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  14. Boothman

    Boothman Elite Member

    Jul 26, 2023
    960
    800
    Wigan
    Watching the video I’d say (despite everything lighting up nicely and the fuel pump priming) it’s your battery. Had very similar situation with my 2013 plate Tiger 1050 someone will be on to advise what volts should be showing on a metre etc but have you a charge pack or other battery to get a jump from?
     
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  15. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Thankyou, The battery was new a couple of months ago so seems unlikely but I'll get it plugged in to check that
     
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  16. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Just to add the first time this happened was halfway through a ride too so should have been OK
     
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  17. Boothman

    Boothman Elite Member

    Jul 26, 2023
    960
    800
    Wigan
    If the battery is good ensure the battery terminal connections are tight and specifically that the other end of the negative is solidly grounded to the bike frame
     
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  18. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    636
    243
    Norfolk
    Can you describe the initial fault when you say it spluttered to a halt. Was it running fine before then? Did it stop running altogether? What is the bike's history? How long have you had it and do you know anything about the previous owner? What is the mileage? The pipes that were adrift would not affect the running but there are other rubber pipes that would. Are the 3 vacuum pipes properly connected to the throttle bodies and is the MAP sensor pipe connected? The MAP (Manifold Absolute Pressure) sensor is screwed to the top of the airbox and has an electrical connector plus a small diameter rubber pipe connected to the underside of the sensor. Check that both ends of the pipe are connected.
     
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  19. Boothman

    Boothman Elite Member

    Jul 26, 2023
    960
    800
    Wigan
    It may be the bike isn’t charging the battery
     
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  20. Tim - Sprint ST 1050

    Sep 25, 2025
    7
    3
    England
    Ok the bike was previously mine and when I became to ill to ride (thyroid cancer) I gave it to my dad to use a f then about 4 years later I got it back so I know it was looked after but it had been on trickle charge when not in use at his and wasn't at my house so the battery died (it was the original battery I had on it for years before he took it) so it was due a new one and was fitted by a garage and I havnt had a single problem with it until I was out riding round and after about 40mins half way round a corner It lost power, the sort of feeling you get if you run out of fuel like its holding back but the screen also went off at the same time as it was happening the split second of power screen back on the same again, lost power and screen off at the same time which happened about 3 times over a maybe around 5 seconds then it died and I coasted to a slightly straighter bit of road and got it recovered I them noticed the fuel breather pipe with check valve and the fuel water drain hoses were detached or missing and the air box water drain pipe were all detached so I assumed that was the issue but they are all now fitted and gently bored a hole through the scale that had built up in the water drain spigot from around the fuel cap because that was blocked and both are now freely draining, also yes all sensors are connected and the hoses that were attached to them are connected too because I removed them to replace the air filter while I was there, I hope this helps to clear a little up, I have never had an issue till now.
     
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