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commando/amc gearbox options/compatability

Discussion in 'Norton Commando Motorcycles (Classic)' started by 84ok, Mar 20, 2018.

  1. 84ok

    84ok

    Joined:
    Aug 10, 2014
    sounds like a shorter main shaft gb ina commando would work then with an atlas clutch, tho dunno if the suitable single row(?) chain comes in diff lenghts..

    then a simple cover could be fabbed but prob the atlas chain runs in oil? like the commando

    have no clue about racing or custom parts options
     
    Last edited: Mar 28, 2018
  2. N0rt0nelectr@

    N0rt0nelectr@ VIP MEMBER

    Joined:
    Sep 15, 2014
    Not quite right, the AMC box which is the one used on Norton Atlas, Dominator and Commando has a different shell from those used on Matchless and AJS motorcycles. The internals are the same.
    John in Texas
     
  3. 84ok

    84ok

    Joined:
    Aug 10, 2014
    might be an easy fix for use of some non commando boxes?
    http://www.clubmanracing.com/beltdrivesnorton.php
    hmmm.. - "Clutch Centre, Atlas Mainshaft, Commando Clutch Conversion"
    http://www.britcycle.com/Products/06/06_3979a.htm

    anyone looking out for a fastback/commando mainshaft - part# 06.0384,
    if you don't know the diffs, or what to look out for, sometimes they show a part # on ebay, tho ebay ads are often wrong

    sez here there are 4
    https://www.nortonownersclub.org/noc-chat/technical2-heavy-twins-forum/411167985


    https://www.rgmnorton.co.uk/dept/shafts_d0157.htm
    MAINSHAFT COMMANDO GEARBOX, 9 7/16" LONG
    PART NO
    060384


    MAINSHAFT PRE COMMANDO AMC GEARBOX, 9 1/4" LONG

    PART NO
    040001

    MAINSHAFT AMC MANX GEARBOX, 8 15/16" LONG
    PART NO
    040001M

    MAINSHAFT SHORT RACING, AMC G50 ETC 8 1/2" LONG
    PART NO
    4A-094

    https://www.nortonownersclub.org/support/technical-support-commando/gearbox-ratios


    Attached table shows choice of internals.
    https://www.nortonownersclub.org/noc-chat/technical2-heavy-twins-forum/411167985/455607617


    https://www.nortonownersclub.org/no...-forum/411167985/455607617/internal-gears-bmp

    some 5 speed stuff
    https://www.accessnorton.com/NortonCommando/5-speed-gear-box.15058/

    https://www.accessnorton.com/NortonCommando/5-speed-gearbox.3364/
     
    Last edited: Apr 1, 2018
  4. 84ok

    84ok

    Joined:
    Aug 10, 2014
    this sounds like a straight atlas to commando clutch swap,
    https://www.accessnorton.com/Norton...do-primary-chaincase-cover.23876/#post-351187

    i think the above quote indicates an atlas g/b can be used in a commando using an atlas clutch? with cdo primary cases?

    any more details?
     
    Last edited: Apr 17, 2018
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