Street Cup Fork Drain Bolt

Discussion in 'Technical Help' started by RevPaul, Jan 1, 2024.

  1. RevPaul

    RevPaul Senior Member

    Apr 21, 2020
    709
    193
    Cheshire, UK
    Does anyone know the size of the bolt in the bottom of the front forks of the Street Cup/Twin up 2018. I.e. thread diameter and pitch and length of bolt?

    Triumph rather unhelpfully list it as a fork drain bolt or something like that.

    Thanks:)
     
  2. Tommi Saarento

    Tommi Saarento Active Member

    Aug 15, 2020
    158
    33
    Gothenburg Sweden
    Sorry i can´t help with exact thread diameter and pitch and length of bolt, loosened them when i put in YSS emulators. They have tight pitch and a lot of Locktite so i would not loosen unnessarely for changing oil or so. Better to use a cheap vacuum pump to suck the oil from above. If you need to open them you need a long quality hex and an air gun, my 18 volt DeWalt battery machine could not rattle them loose.
     
    • Thanks Thanks x 1
  3. Eldon

    Eldon Elite Member

    Nov 14, 2018
    6,155
    800
    North Yorkshire
    Give it a few weeks @RevPaul and I'll tell you when I strip mine.
     
    • Like Like x 1
  4. RevPaul

    RevPaul Senior Member

    Apr 21, 2020
    709
    193
    Cheshire, UK
    Hi @Tommi Saarento that's really helpful information:).

    My original question was to help me prepare to fit my YSS emulators, because YSS's instructions say that the Piston Rods at the bottom of the forks need removing to drill extra holes into them.

    I may have misunderstood your reply, but are you saying that you fitted the emulators without drilling the Piston Rods? If so are you happy with how they emulators are working?
     
  5. RevPaul

    RevPaul Senior Member

    Apr 21, 2020
    709
    193
    Cheshire, UK
    No rush @Eldon, as we've discussed in the Hagon Nitro thread, I'm still in the research stage at the moment and waiting for the Race Tech book to arrive. Apart from colour, their Gold emulators look remarkably like the YSS emulators.
     
  6. Tommi Saarento

    Tommi Saarento Active Member

    Aug 15, 2020
    158
    33
    Gothenburg Sweden
    No, i drilled the holes in the OEM tube (called piston by Triumph). That has to be done for the emulator to function as intended.
    So now you have to loosen them so take off the wheel and loosen the lower bolt before opening the upper fork cap, the spring helps to avoid the the piston turns instead of unthreading, as i wrote i had to use an airgun to loosen the bolt. Same when assembling everything back, just get the bolt to start to thread in the piston, put emulator, spring, washer, spacer and cap back together (without oil). Tighten the lower bolt, remove upper cap, fill oil and cap back.
     
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