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NEW reed valve breather fits all Commandos? (2017)

Discussion in 'Norton Commando Motorcycles (Classic)' started by jseng1, Apr 19, 2017.

  1. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    OK Jackson 5 everybody wants to see your photos of the housing you made.

    Here's my answer to Labs question above about the breather fitting 850 MK3s with the original prestolite starter. I just started making angled threaded fittings for the Mk3s with original starter to replace the original tube breather - plenty of room now. See one way reed valve breather below (with BMW stainless reed). The same basic breather fits all other versions of Commando (& Atlas) but in different locations.
    Photo supplied by customer (thanks Mark).

    [​IMG]
     
  2. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Still waiting. If you need help just ask.
     
  3. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Joined:
    Dec 3, 2012
    Here's part of one I did 18 years ago, the rest is secret of course but looking forward to the twin reed funnel version mentioned on the previous page.

    Reed6.JPG
     
    Last edited: Apr 19, 2019
  4. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    That looks free-breathing.
     
  5. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    For those who have the time, ability and inclination to make things for fun, making your own reed valve breather is a nice pet project.

    For those lacking one, or all of the above, it’s worth reminding here that there are at least 3 suppliers of bolt on reed valve breathers for Norton engines and numerous suppliers of ‘plug n play’ in line reed valve breathers.
     
    concours likes this.
  6. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    Here's a new inline/offset version with 3/8" barbs I just added when a 961 owner asked for it (edited).
    [​IMG]
     
    Last edited: Apr 20, 2019
  7. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Pictures please Jim! And feedback from the owner too.

    There’s a bunch of guys over on the 961 forum that’d be interested in this set up...
     
  8. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    I just sent it to him and I'll ask him for a photo. Give him some time and we'll see if he responds (edited).
     
    Last edited: Apr 20, 2019
  9. ntst8

    ntst8 VIP MEMBER

    Joined:
    Feb 14, 2004
    Hi Eddie, i have one on the way from Jim for my 961 but it is still in transit. The postal pigeons take a while to flutter their way down here, and when they do they will find that NZ is shut for Easter and then ANZAC day next week so i may not see it for a week or so yet.
    Then it will join the queue - I pulled the head off my ES2 yesterday (exhaust port threads :(), so have the opportunity to turn that into a deferred maintenance project and i have my 850 primary apart.... It's nice to have things to do.
    Will update once i get to it. :)
    Edit - nearly forgot, the 16H is in a friends shed waiting for me to get there to spend a day pulling the girders down so he can turn up some spacers on his lathe, then reassemble etc.
     
    Last edited: Apr 19, 2019
  10. JimC

    JimC

    Joined:
    Oct 12, 2007

    Motor Mite valves are a placebo, at best, when used as as a crankcase breather valve. They do work well for a brake vacuum booster check valve.
     
  11. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    Jim,

    Does that bolt right up to the Combat case?
     
  12. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    Yes
    The sump version bolts directly to the Combat case and it comes with a fiberglass reinforced silicone gasket as in the image below . There are other versions to fit an 850 Mk2, an electric start Mk3 or the standard 750 with the breather on the left side case. You can see them all at:
    https://jsmotorsport.com/js-motorsport-technical-reed-valve-crank-case-breather/

    The combat version:
    [​IMG]
     
    Last edited: Apr 20, 2019

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