Drill sizes for main jets ?

Discussion in 'Motorbike Technical Discussion' started by Iowa883, Jun 18, 2004.

  1. Iowa883

    Iowa883 Guest

    I need a drill bit size chart for Keihin main jets . Does anyone have one or
    know a link to one ?
    Iowa883, Jun 18, 2004
  2. Iowa883

    Charlie Gary Guest

    Can you buy drills in such tight increments? Don't know myself, but you've
    sparked some curiosity. Also, will a drilled finish be smooth enough, or
    will you have to chase it with a reamer?



    What do you call a fish with no eyes? A fsh.
    Charlie Gary, Jun 18, 2004
  3. Iowa883

    Mark Olson Guest

    Aren't jets also contoured somewhat, rather than being a simple
    cylindrical hole drilled through a block? IOW, the hole in the
    middle is something like the hole in a donut, not a straight thru
    hole drilled through a piece of flat stock.

    I could certainly be wrong, but I seem to remember reading that
    this is why you couldn't get the exact flow characteristics of
    a larger factory made jet by simply drilling out smaller jet to
    the same sized hole.
    Mark Olson, Jun 18, 2004
  4. Iowa883

    Battleax Guest

    I've never seen this. Every main jet, idle jet, I've delt with are simple
    straight holes.
    If a jet is not available in the size needed then a numbered drill is used
    to enlarge the passage.
    There's no reason to have a venturi shape in a jet.
    Battleax, Jun 20, 2004
  5. Iowa883

    Battleax Guest

    You are correct on the main jet. Drilling such a main jet would be a bad
    Battleax, Jun 20, 2004
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.