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Difference between 3 start and 6 start oil pump?

Discussion in 'Other Norton Motorcycles' started by baz, Jan 25, 2019.

  1. nortonmark


    Oct 18, 2018
    Every time I put on six start in replace of 3 start I moved overhead rocker feed to bottom of the timing chest ala commando style, scrolled or not, I have ruined more cams by lack oil flow from head then any soft cam problems ever encountered.
    Never ran down Atlas cam tho!
    One trick was open oil tank on Atlas and put you finger on oil return momentarily to flush oil to head, now who showed me that trick :)
  2. Gilesy

    Gilesy VIP MEMBER

    Aug 27, 2017
    Yes, my 1962 Atlas has a 6 start pump and scrolled spindles, but as to whether it was supplied like that, I don't know. I have had no issues with over oiling.
  3. Bernhard


    Apr 20, 2011
    There appears to be some dispute as to when the 6 start worm oil pump was supplied by Norton.

    I suspect that, as it was officially fitted from 1966 on, according to the green Norton workshop manual, British suppliers like Dunstall etc, supplied them in their catalogue, and I suspect that Doug Helne fitted them on their overhead rocker supply 500 Domiracer from 1961. Feel free to correct me if I’m wrong.

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