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Clutch Drag ==> Stalls

Discussion in 'Norton Commando Motorcycles (Classic)' started by Tornado, Apr 2, 2019.

  1. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Was already to make first long ride of this year today, but when I went to put it in first gear, clutch held in, clunck! Engine stalled. Tried again, and same stall. On CS, clutch in, I found rear wheel very hard to turn, almost needing two hands. Alway seemed OK the previous two around town rides last week.
    Checked clutch adjuster nut, slackened it off, then turned in adjuster until pressure on clutch spring felt, then back out 1/2-1 turn. This made no difference in hard to turn rear wheel while holding clutch in.
    Could this be a loose clutch basket nut (the one under the plates)? I followed OldBrits rec to only torque to 40 ftlbs not the 70 the shop manual reccomends...used some Locktite on it as well. Primary fluid is fresh, ATF F.
     
  2. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    Any OTHER “maintenance” performed recently?chain adjustment?
     
  3. Danno

    Danno

    Joined:
    Feb 7, 2010
    I would try setting the adjuster to 1/4 turn out and make sure there's just a little play at the lever. Clutch cables elongate over time and the clutch pushrod and the adjuster wears. Clutch plate stack height decreases.
     
  4. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    I've never known my Mk3's bronze plates to 'stick' but they would drag slightly sometimes making 1st gear selection harsh and neutral selection difficult especially if the plates were not removed and cleaned periodically.
    Last year I fitted a set of (5) Surflex friction plates which were a definite improvement.
     
    Pete Mahone likes this.
  5. Mwood7800

    Mwood7800

    Joined:
    Jul 26, 2017
    Clean the clutch plates. It just happened to me. They don’t like any atf on them.
     
  6. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    It depends.
    If you have aftermarket Barnett Kevlars in there then the ATF is ideal.

    A seal of some type on the clutch pushrod can be helpful if even a tiny bit of trans oil is getting on the plates.

    Glen
     
    Last edited: Apr 2, 2019
  7. baldy

    baldy

    Joined:
    May 28, 2013
    Pull in the clutch with the bike in neutral. Push the kickstart. There should be little resistance. If high restance than you have sticky plates.
     
  8. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    More details:
    Some of you know I did the full gearbox tear down and replaced all seals/bushes/bearings/springs over Winter. Had the primary completely off for this, so clutch plates were cleaned, primary chain slack set as per book. I did replace the OEM felt seal inner primary cover...but new one a bear to fit and it didn't seem to be very even along its inner orifice. I did apply healthy smear of grease to clutch rod was recommended. I was running ATF from about 2000 miles ago last season after I had some sticky clutch plates...tended not to full release during on road shifting occasionally...nothing like what it's doing now though. Cable is new last year...Venhill with 4000 miles total.

    I played around with different clutch adjustments and lever free play earlier...from 1/4 to 1 full turn out after resistance point. No difference.

    It is possible some gear oil got on plates...is that enough to give the stalls shifting into first on CS and hard wheel turns with clutch pulled in?
    No one thinks it might be the basket nut torque? I did fit a new circlip.
     
  9. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    OK, tried kicking in N with clutch in...definitely quite stiff.
    I will be pulling primary off to have a good look/cleaning of the plates.
     
  10. ashman

    ashman

    Joined:
    Jul 11, 2010
    Is the ball on the clutch arm in the gearbox sitting right???, I am still running my orginal clutch plates and has over 160k on it, my clutch has always been light and never sticks, have never touched the clutch height and have only replaced clutch centre and primary chains, run AFT F tranny oil in primary 7 fl oz and never over fill my gear box, I don't run a clutch seal and have never had gearbox oil in my primary, so I be pulling it apart to find out why, not a major job and is part of general maintenance, I be taking notice of the ball in the clutch arm as its easy to get out of place when the clutch rod has been removed and reinstalled.

    Ashley
     
    Tornado likes this.
  11. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Ball is correctly located in the lifter arm. Was very careful with that as per MH's gearbox work video. It was all working fine last week on short town rides. Went to pot trying to pull out of my parking spot today. Best guess is too much GB oil, contamination of plates. When filling GB and primary, bike is not fully level as parkade floor slopes a fair bit. Thought it would be close enough...maybe not. Need to watch this I suppose.
     
  12. ashman

    ashman

    Joined:
    Jul 11, 2010
    When I fill my gearbox I use a messuring cup and messure by the book I found out a long time ago by using the level cube in the gearbox it over fills the gearbox and gets oil down the clutch rod, so using the messuring cup I get the right amount without overfilling, usualy its about 1/2 up on the kickstart spring looking through the filler cover when he bike is sitting straight up.
    Been doing it this way for over 40 years and my gearbox only rebuilt when the dreaded lay shaft bearing blew way back in 1979 and have replaced the kick start pawl 4 times, I always go by the book lol.

    Ashley
     
    Tornado likes this.
  13. Lineslinger

    Lineslinger VIP MEMBER

    Joined:
    Feb 26, 2017
    Clutch plates stuck together.
     
  14. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    A Dynodave clutch rod seal is a great mod!
    Everyone should have it.
     
  15. illf8ed

    illf8ed

    Joined:
    Dec 30, 2003
    C clip behind the clutch basket or loose clutch shaft nut?
     
  16. lazyeye6

    lazyeye6

    Joined:
    Feb 28, 2014
    oil on the clutch plates and then they stick together.
    pull out the plates, clean them carefully, reinstall with
    a DynoDave Clutch Rod Seal. Report back if it continues.
     
  17. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Details on the DynoDave seal?

    @illf8ed : yes, that is something I was thinking...ias mentioned earlier, I set that nut to 40 ft-lbs with some blue Locktite as per OldBrits tech doc rec. New c clip was used.
    Will check this once apart.
     
  18. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    Walridge has em.
     
  19. dynodave

    dynodave

    Joined:
    May 28, 2003
    Tornado likes this.
  20. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Thx Sir. Will be placing an order shortly.
     

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