1969 T120 650 Centre Cylinder Head Bolt Thread Type

Discussion in 'Vintage Classics' started by Stationary Traveller, Aug 14, 2024.

  1. Stationary Traveller

    Stationary Traveller Well-Known Member

    May 19, 2024
    23
    53
    The darkest depths of Surrey
    #1 Stationary Traveller, Aug 14, 2024
    Hi all, a mate of mine has the above and has a damaged bolt but is not sure of the thread type to get a replacement. Can anyone help with that..?
    Cheers
     
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  2. speeder

    speeder Noble Member

    Jan 3, 2019
    408
    313
    dorset
    #2 speeder, Aug 19, 2024
    I don't think any of the Meriden bikes were metric, the engine on my 73 bonnie were all unified threads, not sure of the size of the head bolts but as they screw into the cast iron barrel it is most probably a UNC thread.
    Someone with some thread gauges will be able to confirm.
     
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    • Agree Agree x 1
  3. Stationary Traveller

    Stationary Traveller Well-Known Member

    May 19, 2024
    23
    53
    The darkest depths of Surrey
    #3 Stationary Traveller, Aug 19, 2024
    Thanks for that,Speeder, much appreciated. We knew they weren’t metric but weren’t sure if they were UNC or something else as my mate thought that Triumph had made a change to the gauge they used. I think he may have it sorted now.
     
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