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Retrofit Amal Premier pilot jets? (2016)

Discussion in 'Norton Commando Motorcycles (Classic)' started by grayluders, Feb 6, 2016.

  1. Triton Thrasher

    Triton Thrasher

    Feb 10, 2009
    It's not about rpm. It's about how far open the throttle is, as you have already been asked.

    Have you already cleared the pilot jet with a 16 thou guitar string or #78 modelmakers' drill?
  2. ag12680


    Sep 23, 2013
    These carbs were new out of the box so I have not touched the jets.

    Thanks for the correction on the midrange reference.
  3. Triton Thrasher

    Triton Thrasher

    Feb 10, 2009

    Amal sells carbs full of dirt, which blocks the pilot jets, new out of the box.
  4. baz

    baz VIP MEMBER

    May 26, 2010
    yes it is possible to fit premier pilot jets into amal mk 1 concentrics, then as you say you can remove them to clean easily and also fit a different size if you want to cheers baz
  5. Jim Thomas

    Jim Thomas

    Feb 5, 2019
    I was having awful time trying to get my Commando to run with the original .015" jets. Per advice on this posting, I opened mine up to .019" on milling machine (I'm a long time machinist). It still did just a little "lean popping" on decel, and I fixed that by crankiing the mixture screws to 1 turn from closed. That makes the bike run great ! I would be willing to machine jets out to .019 for other folks for $15 a pair + $4.00 to ship them back. I'd do this as a favor to Norton Pals, and not as a way to supplement my income. jwthomas@ttmco.com

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