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Clutch springs. Anyone know of any aftermarket springs that are available.

Discussion in 'Norton Motorcycles (Modern)' started by MarkMk3, Aug 9, 2019.

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  1. MarkMk3

    MarkMk3

    Joined:
    Aug 8, 2019
    Tried the dealer and service agent in Australia but can't supply them.
     
  2. Eljahara

    Eljahara VIP MEMBER

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    Jul 8, 2018
  3. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
    Those are not available from Norton ? Ask Max why .
     
  4. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
  5. MarkMk3

    MarkMk3

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    Aug 8, 2019
    I have been onto Norton for about 8 weeks and they're on backorder, so I'm trying to find an equivalent spring.
     
  6. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
    Last edited: Aug 13, 2019
  7. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
  8. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    Just out of curiosity, why do you wish to change the clutch springs ?
     
  9. lcrken

    lcrken VIP MEMBER

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    Mar 15, 2009
    Are you referring to the split gear spring, or the coil springs in the clutch. If it's the coil springs, as I recall, the clutch is from a Suzuki, so stock and high performance springs should be readily available from aftermarket suppliers. Unfortunately, I don't recall which model Suzuki Kenny Dreer originally sourced the clutch from. As TonyA mentioned, you might be able to sort that out by using the measurements from the Norton springs to identify the right ones at you friendly local Suzuki dealer.

    Ken
     
    Britfan60 and richard-7 like this.
  10. MarkMk3

    MarkMk3

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    Aug 8, 2019
    Because the free length is 50mm and it's dragging and won't engage gear.
     
  11. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
    Is it possible that your clutch push rods have worn down and not giving the required travel to fully release the clutch ? Is your slave cylinder loose or the ball bearing come out ? These things would change the travel distance and not fully disengage the clutch. Is it possible that the hub center nut on the clutch has loosened and allowing the basket to move away from the push rod ? Something like this has happened to Britfan60 a year or two ago . You have the primary cover off because you have measured the springs . Good luck , let us know .
     
    Britfan60 likes this.
  12. Britfan60

    Britfan60 VIP MEMBER

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    Jan 5, 2014
    Yup. Last year....mechanic found that after I changed the slave cylinder and the clutch reservoir and master cylinder. Save yourself a few bucks and check that first. You could bleed it first, but if that doesn't work, check the center nut. Clutch basket moved out a bit.
     
  13. Fast Eddie

    Fast Eddie VIP MEMBER

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    Oct 4, 2013
    I see the OP states the free length of his springs are 50mm. How long should they be?

    I don’t quite see how clutch springs can make the clutch drag?

    If they compress through use, they’ll likely slip.

    Can’t see how they can become longer in use, but even so, that would make the clutch lever action heavier, but unless they were too long when fully compressed, they’re not gonna reduce the lift, therefore they’re not gonna cause drag...

    As already mentioned by others, faulty cylinder, worn rod, etc would be where I’d be looking...
     
    richard-7 likes this.
  14. MarkMk3

    MarkMk3

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    Aug 8, 2019
    Clutch spring free length is 54mm, service limit is 52.75mm. Mine are 50mm and won't release properly.
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    The clutch springs clamp the plates closed, or engaged.

    The clutch springs do not release, or disengage, the clutch plates. The clutch pushrod does this, which is in turn moved, or pushed, by the cylinder on the gearbox outer cover. The clutch springs push AGAINST this motion.

    As you state, your springs are outside of the service limits, so they do need changing. But I fail to see how new ones will resolve your dragging clutch issue. I would suggest further investigation whilst you have it down this far.
     
    Last edited: Aug 20, 2019 at 3:25 AM
    richard-7 likes this.
  16. roadrocket1098

    roadrocket1098

    Joined:
    May 14, 2015
    Hi Guys

    I had a lot of problems with my 2010 961 SE clutch and tried to find out as much as I could

    I hope the following may be of some help to owners & members of the forum

    One of the many I contacted was EBC Brakes, who were excellent

    This is a quote from them,

    "I have looked at the spring – 219 different types here now and can only match it to our CSK126 (nearest we have so check fit and feel of this item to see if it will do the job)"
    N.B. I have not personally tested this spring on my 961 SE yet, so do not know how effective it is

    With respect to 961 clutch plates (and I can only quote again what was on my 2010 961 SE)
    I also did hear that the clutch was of Suzuki manufacture on the 952 Kenny Dreer prototypes
    However the clutch on my 2010 961 SE, appears to be from a Yamaha R6

    Quote:
    "The friction plate with the number 383 stamped on it is a Yamaha plate – their p/no 383 16321 00 and relates to our CK2255 which has 8 plates and has a thickness of 3.00mm from new.
    Now the steel plates we only sell in a kit with springs and I don’t have a listing for 7 steels and the friction plates at the moment – again part was Yamaha and is our P43 and Yamaha reference is 31A 16325 00."

    I hope this is some help to members

    Cheers

    Roadrocket
     
    Clive likes this.
  17. lcrken

    lcrken VIP MEMBER

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    Mar 15, 2009
    Good info, rocket. Thanks for posting.

    Ken
     

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