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Suggest frame mods

Discussion in 'Norton Commando Motorcycles (Classic)' started by olympus, Mar 10, 2018.

  1. coomo

    coomo VIP MEMBER

    Joined:
    Oct 10, 2018
     
  2. coomo

    coomo VIP MEMBER

    Joined:
    Oct 10, 2018
    I intend to do this frame "upgrade" ie the crosspiece welded in between downtubes.In Europe (HNW) its referred to as a "Thruxton" modification.Any idea on how far down
    its welded in guys?
     
  3. kommando

    kommando

    Joined:
    May 7, 2005
    No set place but 1/2 way between the bottom of headstock and the front iso tabs would be both effective and easy on the eye.
     
    coomo likes this.
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Ken do you know what that little extra cross tube is supposed to do? What forces it’s acting against or failures it protecting against?
     
  5. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    Flex and splaying of the front down tubes, especially under hard braking. Look at pics of the Dreer 880s and he did this mod as well. When I did my recent resto I made this mod.
     
    coomo likes this.
  6. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Sorry for the delay in answering. I've been without internet access for a few days because of the local fires. Anyhow, the answer is pretty much what gortnipper said. It was a fairly common mod for race Commandos back in the '70s, and I copied the idea from someone else back then.

    Ken
     
  7. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Thanks Ken.

    Hope you and yours are all safe ?
     
  8. cjandme

    cjandme

    Joined:
    Feb 5, 2011
    I like the idea of the front down tube cross brace and the valve spring underneath to help out the isolastic rubber mounts in keeping everything lined up where it is supposed to be, while still allowing for freedom of movement..... P. S. Are the California wild fires headed your way Ken? I sure hope not, take care though, Cj
     
  9. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    One of the fires started 2 miles from my house, and I had a good view of the flames from my front porch. We were on evacuation watch for a while, but fortunately the wind blew the fire almost directly away from us toward the coast. The fires are still growing, but not in our direction. I think we will be fine, but we have the motor home ready to leave, just in case. It is a bit distracting, though:eek:

    Ken
     
  10. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Master of understatement Ken...!
     
  11. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    Yeah, my cousin's house had their yard burn, and their windows explode and the side of the house charred. But it was saved. Not great, but could be a lot worse.