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1973 Mk1 Rebuild, back from the grave!

Discussion in 'Norton Motorcycle Rebuilds' started by Tony Pierce, Mar 16, 2019.

  1. Tony Pierce

    Tony Pierce VIP MEMBER

    Joined:
    Mar 7, 2019
    First off, I'd like to thank everyone for the wealth of knowledge on this forum. I have built or modified quite a few bikes in the past (Ducati, Yamaha, Honda, Triumph) but never a Norton.

    My father in law came in from out of town about a week ago, bearing gifts from Arizona. With him in the back of his truck was a Norton Commando, purchased in 1974 as new (build date on frame is June 1973). He rode it for a few years, but it has essentially been sitting for close to 40 years.

    It is in pretty rough shape, but it is a labor of love. I really enjoy working on motorcycles, and I can't wait to see the look on my father in law's face when it is finished. Although he gifted it to me, this is something I will keep forever and cherish. In it's current condition many people might have just parted it out, but I think under the patina there is great potential.




     
    Last edited: Mar 16, 2019
  2. Tony Pierce

    Tony Pierce VIP MEMBER

    Joined:
    Mar 7, 2019
    I plan on doing a complete frame off restoration on the motorcycle. When I went to split the primary drive I was surprised how good everything looked. Chain was good, clutch looked great.

     
  3. Tony Pierce

    Tony Pierce VIP MEMBER

    Joined:
    Mar 7, 2019
    I pulled the motor out last night, and removed the head and bores. I will need to bore out the cylinders and install new pistons and rings. I also plan on rebuilding the head in installing new crank bearings, although that is probably not required. The motorcycle only has 6500 original miles on it.

    Is there a consensus on the best bang for buck on pistons and rings? I need to place an order soon.




     
  4. htown16

    htown16 VIP MEMBER

    Joined:
    Apr 29, 2009
    EMGO pistons, Hastings rings. Reasonable cost and proven performance. Your cam looks in good shape. You made the right decision. That bike was way too nice to part out even if the outside is a little crusty. That primary looks like new.
     
  5. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    The gutty works look very nice. Some TLC and that's going to become a jewel. Wish I had your opportunity.

    That's not rough...only well seasoned.
     
  6. Tony Pierce

    Tony Pierce VIP MEMBER

    Joined:
    Mar 7, 2019
    Thanks for the comments! I ordered the pistons and rings and will contact a machinist on Monday for the jug machine work. I have plenty to keep me busy until I get them back!
     
  7. Tony Pierce

    Tony Pierce VIP MEMBER

    Joined:
    Mar 7, 2019
    I have contacted Mr. Comstock as suggested, and he is machining out the cylinders for me soon. Just crated them up and will ship them to him tomorrow. He has his work cut out for him, I managed to slip and chip a fin! Bummer!



    I worked today for a while cleaning the heads up. Once I get the cylinder back I will ship out the head for refurbishment as well. It doesn't have many miles on it, but I want to do things right. I will end up replacing valves, springs, and guides I think. For some reason the exhaust rings absolutely refused to come off. The exhaust was trashed, so I ended up just cutting it off and will have the head shipped out for machine work with the rings- hopefully he can remove it ok. I was afraid of breaking something after destroying the spanner I purchased (Andover Norton).
     
  8. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    Keep on plugging & you'll get it...I believe my top end is coming down maybe this next fall for a long overdue inspection. Mainly because of an oil leak starting between the head & jug at the push rod tunnel. Not side tracking your thread, just wanting you to not feel all alone in the dark.

    I hope mine stops there though.
     
    Tony Pierce likes this.

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