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Restoring my 73' 850 Commando

Discussion in 'Norton Motorcycle Rebuilds' started by Chris Larkin, Feb 13, 2020.

  1. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
    Working with a bike mechanic I trust, who prefers to work on Harley's... we’ve come to the conclusion my 73’ 850 Commando is worth restoring.

    So far I’ve replaced the tires with Avon AM26’s and replaced the points with a Tri Spark ignition. It idles well, runs OK, but stutters at higher rpms. Both cylinders tested out at 120psi compression. I’ve done some fundamental polishing and it is responding well to the care. But I want it to be better – with the goal of keeping it original as possible.

    I believe I need to tear down to the frame because many of the foundation parts (bushings, rubber dampeners, etc.) are worn, and a safety concern, thus prompting the restore / replace before I get into serious riding.

    My purpose for writing today is to start a thread where I can connect with members who have experience with this process, with whom I can turn to with questions and such. I see it taking a year, hopefully less, but my time is limited to weekends and when I’ve not been assigned home landscape chores on the weekends.

    Step one… I should probably get a book on this… yes? May I have a recommendation, or two? Thank you, Chris
     
  2. NickZ

    NickZ VIP MEMBER

    Joined:
    Oct 31, 2018
    Do you have the workshop manual?

    http://britmoto.com/manuals/Manuals/750_man.pdf
     
  3. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    Whatever you plan to spend, DOUBLE IT! hee hee
    Good to have a "known quantity" before you start. Starting with a basket case or non-running project is much harder.
     
  4. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
  5. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Re; " it stutters at higher revs" it may be the fuel system is overdue a good clean, remove petcocks an clean and flush tank out, ditto carbs float bowls, you may need new needles and needle jets. Have you checked charging system with multimeter across battery terminals? Electronic ignition does not like being starved of current.
     
  6. Richard Tool

    Richard Tool

    Joined:
    Aug 3, 2019
    Hi Chris and welcome - lots of knowledge available on this site from some very experienced folks . Joining up here is probably the single best thing you could have done for help in your project. I agree with the others on obtaining shop and parts manuals and also use of Andover Norton’s site - excellent drawings & photos.
    For cleaning out carbs and other fuel system bits I use an inexpensive ultrasonic cleaner . Mine came from Harbor Freight and IIRC it was around $70- $80 . Well worth the minimal investment.
    If you are getting in to the engine and/or gearbox get the Mick Hemmings videos available from the UK based Norton Owners Club. NOC is also an excellent source of information, particularly for older non-Commando models.
    We all love to follow other people’s efforts so by all means post your efforts here - pictures are a plus.
     
  7. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
  8. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019

    Very helpful materials & advice - Thank you
     
  9. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
    Locally, this was suggested as a possible symptom... also contributing to the reason to restore. These tasks will a part of the project - Thank you
     
  10. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
    Thanks for the information and encouragement. I will post picks. I'm also considering collecting periodic video for a "if this dummy can do it, so can you" type instructional. I'll look into the cleaner - thanks
     
  11. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
    I forgot to mention in in San Diego, CA USA - I'd be stoked if y'all have any recommendations for people or shops to reach out to for service. I'm acquainted with a few folks who seem to know Norton's - but the more contacts the better. Thank you.
     
  12. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    +1 on the Mick Hemmings DVDs. They were invaluable learnings from a guru.

    http://bracebridge-street.com/tech.htm

    Also, for more great videos and technical info Jim Comstock (comnoz here on AN) is right there with him. Trust him. He has great videos on his you tube channel under James Comstock.

    Also check out the Mi Ty channel for great rebuild videos. Very wel presented.
     
  13. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019

    This is all incredible... great resources - Thank you
     
  14. Scout63

    Scout63 VIP MEMBER

    Joined:
    Nov 24, 2016
    Best of luck Chris. The forum was invaluable in my restoration and pushed me to a level of care that would have been impossible. Not knowing what you don’t know is a killer. +1 on the Norton workshop and parts manuals and I found Old Britts to be a great resource for parts and technical articles. And without pictures it never really happened.
     
    Eljahara and gortnipper like this.
  15. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019

    Thank you, you have confirmed my process so far... - I have the manuals, book-marked multiple on-line vids, and have become friendly with Ella and Fred at Old Britts... After my son's wedding this weekend, then a 5 day snowboarding trip to Idaho... I begin by starting with carb rebuilds.
     
  16. NPeteN

    NPeteN

    Joined:
    Nov 20, 2018
    If youre going into the gearbox buy the Hemmings DVD. Next best thing to having someone walk you through it in person.
     
  17. Chris Larkin

    Chris Larkin

    Joined:
    Aug 26, 2019
     

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