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??? - original mufflers - ???

Discussion in 'Norton Commando Motorcycles (Classic)' started by joe czech, Sep 29, 2019.

  1. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    I tried a search, but still a little confused - besides, any and all photoshop pics are out of focus. so my question - is this an original Mk2 muffler?

    [​IMG]

    [​IMG]

    [​IMG]

    any other identifying characteristics? TIA....
     
  2. Matchless

    Matchless

    Joined:
    Dec 23, 2010
    They could possibly be original because of the way the screw boss's are brazed on to the wall of the silencer. Later versions had a plate between the two elements to strengthen the mounting. When these bikes were two or three years old that was a common failure point.

    Martyn.
     
  3. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
  4. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    I may by wrong but I think all the original ones had the weld ground off where the reverse cone is welded on
     
  5. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    Last edited: Sep 29, 2019
  6. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    Not all. Some were seamless (S type) and some were not.
    Some had the Norton logo....others didn't. Edit: However, According to Joe Seifert (ZFD) in a previous post, the Norton logo was stamped on later replacement peashooters.
    https://andover-norton.co.uk/en/shop-details/20908
     
    Last edited: Sep 29, 2019
  7. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    hard to tell, but it kind of looks like a somewhat smooth transaction into the reverse cone - https://get.google.com/albumarchive...k&authKey=CPnx5abjo4XU5AE#5778264570636546482 , so that sounds like it may be a keypoint. my outlet seems a bit smaller than, what i'm assuming LAB posted as an original peashooter...

    just curious as to what I have - if not OE, may sell them, and if OE, keep them as part of the bike. right now, it came with new (repro) dunstall mufflers, and I purchased new header pipes (without crossover-balance tube). getting close on installing the exhaust - have several options at this point. I have the same issue with the header pipes - OE/non-OE - ???
     
    Last edited: Sep 29, 2019
  8. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    one additional detail -

    these mufflers have a series of fins or louvers within the internals. three sets 120° apart. they run from approximately the muffler mounts to the (near) outlet - not the best pic, but you get the idea...

    [​IMG]
     
  9. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    Original Mk2 muffs had welded mutes in the outlet. I’ve never seen a replacement. I’m guessing those ore OE.
    Further more. The Mk1 had removable mutes with a set screw that always rattled out but left a little hole on the inside of the outlet.
    The silencers we see nowadays are actually 750 style.
     
  10. maylar

    maylar VIP MEMBER

    Joined:
    May 13, 2007
    The welds on that pipe are way too fugly to be original.
     
  11. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    Good point Maylar. I’m looking on my phone, can’t see them real well. Looking. Again they are pretty nasty.
    But I will throw this out, does anyone remember any aftermarket silencers with the welded mutes?
     
  12. ashman

    ashman

    Joined:
    Jul 11, 2010
    They could have been repaired at some stage of its life, hence the bad welds.
     
  13. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    so, what we have, or what I have, is mufflers with ugly welds, not up to what's perceived as factory standards, but welded mutes not typically seen on aftermarket or repro mufflers. from the replys, i'm reading this as, "maybe they are, maybe they're not". the outlet diameter appears close to the 1.25" original dimension, and the internal fins, louvers, or whatever they're called, and from what i'm reading, is an internal feature of original peashooters. just got ugly welds. still unsure and somewhat confused. one thing for sure - previous owners seemed to have save every nut and bolt associated with this bike, including these mufflers. original or not, i'm leaning toward installing these back on the bike. again, thanks for the input and feedback - ;)
     
    Last edited: Sep 30, 2019
  14. jimbo

    jimbo VIP MEMBER

    Joined:
    Sep 25, 2004
    I have an original muted pea shooter around somewhere I could dig out
     
  15. maylar

    maylar VIP MEMBER

    Joined:
    May 13, 2007
    I did, back in the 80's. Don't remember the make - Emgo or Dommie Racer probably. They were restrictive and quiet - I took a hole saw to them and opened them up. Much better.
     
  16. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    if you can, post a couple detailed pics.
     
  17. jimbo

    jimbo VIP MEMBER

    Joined:
    Sep 25, 2004
    here you go
    DSC00350.JPG DSC00351.JPG DSC00352.JPG DSC00353.JPG DSC00354.JPG
     
  18. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    thanks....
     
  19. marshg246

    marshg246 VIP MEMBER

    Joined:
    Jul 12, 2015
    And LOUD
     
  20. joe czech

    joe czech

    Joined:
    Feb 21, 2019
    [​IMG] [​IMG]

    the welded or brazed end of your originals look very similar to mine. my exit diameter is 1.0 inches whereas yours appears to be slightly smaller yet. still can't say without a doubt if mine are originals or not, but i'm leaning in that direction. my 74 was pretty much a survivor when I got it. it was a somewhat an abandon project - half apart, not running, but with few exceptions (major items - tires, battery, tool kit, handlebars, and rear grab bar), all the parts were there - down to the nut and bolt level. overall, it was original - even the paint, so I have no reason to doubt the originality of mufflers. problem is, I can find no identifying marks that point back to original equipment - only speculation.

    [​IMG]
     

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