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Triumph 1970 T100

Discussion in 'Triumph (Classic)' started by click, May 13, 2019.

  1. click

    click VIP MEMBER

    Dec 27, 2008

    I got a Premier carb for my 1970 T100.

    My air screw is 3 and 1/18th turns out this gives me a steady tickover but feels a bit 'woolly' coming off idle.
    High speed runs give a light biscuit brown on the porcelain of the plug so, I think, the needles, NJ, slide & MJ seem to be OK?

    The PJ has two rings, so #17

    Since the air screw, being 3 and 1/8th turns out, is leaning out the mixture do I need to go to a #15 PJ, which I think is leaner?

    This is my chart, is this correct?

    Amal Premier PJ

    1 ring #15
    2 ring #17
    3 ring #19
    4 ring #21
    5 ring #23
  2. Bernhard


    Apr 20, 2011
    Re; “Since the air screw, being 3 and 1/8th turns out,”

    With Amal’s ,they are designed to run, at best , 1 1/2/ turns out. That is one complete turn-or 2 half turns plus another half.

    Your “being 3 and 1/8th turns out,”- are you sure it’s not 3 half turns out?

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