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Thread: Clutch on S4R

  1. #1
    Join Date
    25.11.2018
    Location
    Chester
    Ducati models
    Monster S4R
    Posts
    4

    Default Clutch on S4R

    Hello, first post and my first Ducati! I've had this issue for about 6 months, hasn't really been a problem but I don't think its right....
    If you pull the lever slowly it goes to the handlebar, as if there is no system pressure.

    If you pull it with a bit more conviction, it operates normally, it seems to get hold of the pressure in the system as you would expect. If you start the pull with an initial grab (2-3 mm of lever travel) it seems to grab the system pressure and then you can pull the lever the rest of the way as normal - slowly (as in sipping the clutch) or fully as in coming to a stop. If you pull slowly (no pressure in the lever) then pull harder you get a partial engagement, feeling the pressure in the system as soon as you initiate the harder pull of the lever.

    Theres no air in the system, I've changed the fluid, cleaned the slave up and it operates normally if you are not limp wristed with the lever!

    Any ideas would be most welcome!
    Thanks

  2. #2
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,599
    It sounds like the master cylinder seal is leaking. I you pull gently the fluid could be leaking past the seal so that it doesn't build up pressure but if you pull it quickly the initial pressure makes the lip of the seal flare creating a seal against the cylinder bore so that it works normally. Air in the system won't be the issue, the fluid leaks past the seal and just doesn't go anywhere.

    Oh! and welcome to the forum.

    Old enough to know better, young enough not to care

  3. #3
    Join Date
    25.11.2018
    Location
    Chester
    Ducati models
    Monster S4R
    Posts
    4
    Thanks Derek
    The manual I have says 'no repair' apart from the lever, reservoir and fasteners. But do you know if this will this fix it?

    https://www.wemoto.com/bikes/ducati/...der_repair_kit

    Or is it a new MC ?

  4. #4
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,599
    Quote Originally Posted by MTP View Post
    Thanks Derek
    The manual I have says 'no repair' apart from the lever, reservoir and fasteners. But do you know if this will this fix it?

    https://www.wemoto.com/bikes/ducati/...der_repair_kit

    Or is it a new MC ?
    Generally repair kits aren't available for Brembo master cylinders and calipers except from KTM if you know which fits your bike, so that kit from Wemoto is a good find that should fit a few other models too. At the price it's worth a try as the list price for a new master cylinder is 181.34

    Old enough to know better, young enough not to care

  5. #5
    Join Date
    25.11.2018
    Location
    Chester
    Ducati models
    Monster S4R
    Posts
    4
    Thanks Derek, had another fiddle last night but no joy. I've ordered a new MC and hope that sorts it. The manual says don't so I won't!

  6. #6
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,599
    I'd have tried the seal kit first but good luck with it.

    Old enough to know better, young enough not to care

  7. #7
    Join Date
    25.11.2018
    Location
    Chester
    Ducati models
    Monster S4R
    Posts
    4
    New MC fitted and problem solved. Thank you Derek, top man.

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