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Muffler Mounts (2011)

Discussion in 'Norton Commando Motorcycles (Classic)' started by Torontonian, Dec 16, 2011.

  1. hobot

    hobot

    Joined:
    Oct 19, 2005
    Well the couple of Nortons I had with open headers were quick enough police could not catch us but do worry farmer might shoot at me scaring weight off their cattle or waking them up. Peashooters weigh ~6.5 lb, not counting the hangers.
     
  2. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004

    Service Release N.81 (March 1972)

    p.3

    (Drawings of the modified bracket are included in the Service Release.)
     
  3. hobot

    hobot

    Joined:
    Oct 19, 2005
    Waldridges has main office in canada and another in US and has ordered parts for me from Europe w/o much extra cost or time. http://www.walridge.com/
     
  4. Nater_Potater

    Nater_Potater VIP MEMBER

    Joined:
    Apr 7, 2013
    Very interesting! I assume this was corrected from the factory after '72, as ours was like this "out of the crate". Thanks for the history lesson.

    Nathan
     
  5. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    The service release is dated March 1972, so according to the wording, they were already fitting the modified RH bracket by then.
     
  6. acadian

    acadian VIP MEMBER

    Joined:
    Mar 5, 2010
    Picked up the set of isolastics ordered locally from ackland-grainger. 50 durometer, not sure what the originals are, but these are noticeably denser. As with the other post, the stud is a c-hair long and required trimming. Also noted something interesting when closely compared with the old ones, the stud on the iso's received from a regular commando supplier are not integral to the outer plate. On the new ones the thread and plate are one unit. According to the specs given by grainger, these are bonded to a solid (not hollow) piece of rubber. Will be interesting to see if they do outlast the mounts we seem to be stuck with from various suppliers these days

    [​IMG]

    [​IMG]
     
  7. Nater_Potater

    Nater_Potater VIP MEMBER

    Joined:
    Apr 7, 2013
    Good call! As noted back on page 3, I used McMaster-Carr's 60A durometer, and am now thinking 50A would have been better. Let us know if you notice any change in isolastic action, as mine seems to transmit more vibration at low rpms, and the "smooth point" moved up from around 2500 to 2800 rpm. 'Very curious to hear about yours.
    Don't forget the new hardware, as I see yours are also course thread. This would preclude their use as tank mounts.

    Nathan
     
  8. hobot

    hobot

    Joined:
    Oct 19, 2005
    The common Harley variety is a bit more robust in density and width and back up plate similar to those shown above. I get more life out of these on head steady and silencers and header bends and rough surface isolation by 1/3 deep waist, expect for the ones that holds oil tank front mount and the under tank mounts. I gave up on resisting bouncing jouncing like strong but brittle tree in a storm for more flexible wealer palm trees in hurricanes.
     
  9. drp

    drp

    Joined:
    Feb 11, 2011
    I found some ones on eBay that have springs welded to the inside of the plates and the springs are encapsulated in rubber so they look just like the Norton ones. I was going to try these on my muffler mounts and see how they hold up. My current ones are fine so I haven't tried them yet. I also have found that I can buy the Harley ones, without the springs, dirt cheap at the local swap meet.

    Dave
     
  10. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    I’ve been using these, with a 5/16-18 x 3/8” bolt, so they clear the swing arm with no cutting.
    4FE0C9E7-46E6-4D26-8D49-94FC2FA8A72B.jpeg 0604CC81-3906-4BA5-8B33-A188FCE96854.jpeg
     
  11. marinatlas

    marinatlas

    Joined:
    Nov 4, 2007
  12. Onder

    Onder

    Joined:
    May 11, 2010
    Did not hobot waist the spools at some point so there was more give? It isnt the life of the rubbers that matters but the life of headers and
    exhaust ports.
     
    concours likes this.
  13. johnm

    johnm VIP MEMBER

    Joined:
    Feb 26, 2008
  14. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    These are wickid soft, 30 durometer
    06F31FE6-0B19-4C81-8B40-D76E100E3802.png
     
  15. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
  16. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    McMaster will not ship to NZ. :(
     

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