ZipTy FCR idle mixture screw in a BST

Discussion in 'Thumpers' started by creeper, Feb 14, 2005.

  1. creeper

    creeper Still alive...

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    Based on a thread started by accadacca here... I ordered a ZipTy Racing idle mixture screw.
    Got it today. With shipping, they are close to 30 bucks.

    A few photos, a few measurements.

    [​IMG]

    "Tip to thread face"........Stock .6310" - ZT .6165"

    "Tip length"...................Stock .1095" - ZT .0805"

    "Base diameter".............Stock .0495" - ZT .0365"

    "Tip diameter"................Stock .0295" - ZT .0295"

    The most relevent dimensional difference is the tip length @ .029". Oddly enough, the base diameter of the stock tip only changes about .003" for about .030".

    [​IMG]

    Sorry 'bout the focus... camera couldn't make up it's little mind.

    [​IMG]

    Anywho... that's it for now. Went in no problems. It'll be a few days before I can test and tune.

    Creep

    Almost forgot... if any locals want to borrow this to pull or adjust their screw, you know how to find me.

    [​IMG]
    #1
  2. cugino pegaso

    cugino pegaso 141.7 MPH in DIRT

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    to be on the safe side, and to dampen the swinging moment (which can ruin the threads in your carb) I'd put an 'O-ring' on the knob side of the threads (just above in picture, just below while inverted/mounted). A ring that is thick enough so that it rubs between the shaft and the carb housing. This will add a second point of contact and help prevent the knob from acting as a pendulum. The extra friction will also help prevent the adjustment from walking around under vibration...
    #2
  3. meat popsicle

    meat popsicle Ignostic

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    excellent tip cugino. lookin forward to your tuning review creeper.

    now if only y'all had found this a couple of weeks ago before I bought one of these for the same amount of money:

    [​IMG]

    :bluduh - anyone not switching wanna buy it? I am considering selling it and buying this new fangled part...
    #3
  4. creeper

    creeper Still alive...

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    It's a little on the cold side right now... :vardy

    I had one of them white boxes with a red X in it once... never could sell it. :D
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  5. ChrisC

    ChrisC Amal sex?

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    Get your sissy "weißes Arsch" out there and tune that thang.... :eek1

    The Cult is waiting.............

    :pui
    #5
  6. creeper

    creeper Still alive...

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    Cult? There's a cult?
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  7. meat popsicle

    meat popsicle Ignostic

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    not in your heated garage... :lol3

    fixed pic link, dang sudco
    #7
  8. The Walrus

    The Walrus Gone and back again.

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    Cult


    Hostages



    You decide
    #8
  9. creeper

    creeper Still alive...

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    "Dang" 'em... :oscar
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  10. meat popsicle

    meat popsicle Ignostic

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    didn't you get the memo?

    :dood
    #10
  11. creeper

    creeper Still alive...

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    You mean the one I sent out? About our self-appointed "hall monitor"? :poser
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  12. accadacca

    accadacca Hard Rocker

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    FYI...When my Dad installed his last summer, he just followed the instructions in the little paper that came with it. Like 1.5 turns out, then fine tune by revving the motor and making small adjustments. We ride from 4500ft to over 10,000ft and he has not needed to touch it. He bought it to be able to get in there if needed. Ironically he has never need to. When he tuned it we were at about 6000ft?
    #12
  13. creeper

    creeper Still alive...

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    And that's why I'll start at 2 turns... I'm at near sea level. :D

    The range of "useful" adjustment is a bit limited on the ZT screw, compared to the stocker... fewer turns to a completely open passage. We'll see soon enough. :wave

    Tell your Pa thanks again for being the high altitude "beta tester" on this... I guess I'm gona' be the low altitude guy. :huh
    #13
  14. meat popsicle

    meat popsicle Ignostic

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    oh, right.

    (um, is that me? :arg)
    #14
  15. ChrisC

    ChrisC Amal sex?

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    :lol3
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  16. accadacca

    accadacca Hard Rocker

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    Nice close ups of the screw......My fu*%in camera would not focus for nothing! 8.1 mega piece of *%^$!. :baldy
    #16
  17. creeper

    creeper Still alive...

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    I only got this camera a few months ago to replace a first gen. POS Fuji that would no longer upload. It's a Konica Minolta Dimage X31 and it wasn't really very expensive... couple hundred bucks.
    That adjuster tip close-up surprised me how crisp and clear it was.
    #17
  18. accadacca

    accadacca Hard Rocker

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    :lol3 :poser That's a hoot! Packin' that thing around....You'd have to mount it on yer bike somewhere. :lol3 What the hell!! :smile6
    #18
  19. accadacca

    accadacca Hard Rocker

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    I just got this one and need to figure out how to run it properly. :baldy
    #19
  20. creeper

    creeper Still alive...

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    I just don't have enough free time (or inclination) to learn how to be expert at shit like cameras, cell phones, cordless phones, and all that other crap that is so uselessly "feature" ladden that the basic operation requires a magic decoder ring/whistle. :D
    #20