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(74 Mk2) -- what is this? what's it for?

Discussion in 'Norton Commando Motorcycles (Classic)' started by joe czech, Aug 21, 2019.

  1. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    found this rubber piece on the floor. not sure, but i'm thinking it goes in the trailing arm bracket - correct? what's it for? i'm thinking it has something to do with the chain guard and/or mounting or maybe the chain oiler hardware. drawing a blank - ???

    [​IMG]

    any help?
     
    Last edited: Aug 23, 2019
  2. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    Is it solid or hollow as the the chainguard retaining bolt would normally go through that bracket?

    One possibility is that it was a spacer substituted for the chain oiler tube which would normally have fitted where the two holes are in the chainguard ahead of the shock mount.
     
  3. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    thanks for the reply -- it's solid. when I got the bike, the chain oiler was DOA and in pieces in the parts box. there wasn't a bolt for the chain oiler's location in the chain guard.

    it appears the forward hole in the chain guard is what mates to that trailing arm bracket. I went into the garage and reassembled the chain guard. the rubber piece appears to be a spacer for the forward chain guard mount/bolt. the bolt is on the upper radius part of the bracket and the rubber block below the bolt. i'm second guessing here, but it looks like it goes together something like this -

    [​IMG]

    the spacer keeps the back edge of the chain guard from resting on the trailing arm itself. again, second guessing....
     
    Last edited: Aug 23, 2019
  4. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    Could perhaps be original but there's only the 1/4" bolt according to the diagrams and parts books.
     
  5. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    agree - I could swear I've seen a pic of that rubber block here on the forum - ????
     
  6. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    Beach and cash like this.
  7. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    so, i'm taking it that it should be there. wonder why it's not called out in the parts book? I guess we can say, puzzle solved. LAB - thanks for the help.


    from the link...

    "Yet another first, I've never seen one of these rubber nubs under the front chainguard crossover bolt"

    [​IMG]
     
  8. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Good find. I ha 've nt mounted my chainguard on the 850 but hope to someday. Will cobble something like this together from a bit of tubing.
    Question: has anyone fashioned some sort of chain rub pad to fit over the swingarm chainguard bolt bracket? Seems odd the chain can just eat away at the bracket.
     
  9. HRD

    HRD

    Joined:
    Mar 21, 2011
    Yes ,that rubber part was originally fitted ,was/is on my 850 MkIIa .It stops the chain guard vibrating and holds up the bolt so chainguard does not lower and rub on top of chain .Not sure that it was itemised in the supplement parts book .
     
  10. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    I have exactly one of those on my 74 850.
     
  11. jimbo

    jimbo VIP MEMBER

    Joined:
    Sep 25, 2004
    heres a photo on the 2800 mile JPN

    DSC00141.JPG
     
    p400 likes this.
  12. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013

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