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spigots(?) on cylinders

Discussion in 'Other Norton Motorcycles' started by dguzzi, Jun 9, 2019.

  1. dguzzi

    dguzzi

    Joined:
    Jan 28, 2017
    Not sure if the terminology is right. What engines had cylinders like this? [​IMG]trouble with pictures. https://ibb.co/zm7g81c
     
  2. Time Warp

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

    Joined:
    Dec 3, 2012
    The early 750 Norton Atlas.
     
  3. dguzzi

    dguzzi

    Joined:
    Jan 28, 2017
    ok, thats interesting. Wonder if I have cylinders that go with them...
    Thank you for the response!
     
  4. p400

    p400 VIP MEMBER

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    Jul 14, 2014
  5. Ron L

    Ron L VIP MEMBER

    Joined:
    Feb 27, 2004
    You can have the spigot milled off and use a later cylinder head.
     
  6. Time Warp

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

    Joined:
    Dec 3, 2012
    Might be the photo, but those threads look smaller than Commando.
     
  7. bill

    bill

    Joined:
    Jun 1, 2003
    they are. the early ones used 5/16 bolts

     
    Last edited: Jun 10, 2019
    Time Warp likes this.
  8. triumph2

    triumph2

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    Aug 13, 2008
    Up to 1965 the Atlas had spigotted cylinders.
     
  9. dguzzi

    dguzzi

    Joined:
    Jan 28, 2017
    The holes are 5/16. I knew it wasn't Commando. Thanks for the help. Now to find a home for them.
     
  10. Time Warp

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

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    Dec 3, 2012
    73 mm bore ?
     
  11. dguzzi

    dguzzi

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    Jan 28, 2017
    Sorry I missed that question caliper says ~76.2mm
     
  12. marinatlas

    marinatlas

    Joined:
    Nov 4, 2007
    76.2mm bore is a lot........o_O
     
  13. dave M

    dave M

    Joined:
    Oct 19, 2005
    Ron L is correct , you can mill them off and use them for later motors and also for Commandos if you simply drill and re-tap the 4 holes for the cylinder head bolts to the correct size and thread, the spacing is the same. I have done this for one of my Commandos, these cylinders tend to be quite a bit cheaper than the Commando ones.
     
  14. dguzzi

    dguzzi

    Joined:
    Jan 28, 2017
    Correction on the bore 74mm. Better tools at work...still just calipers though,..

    How to tell lifters commando or atlas? These have none but I might have them here.
     

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