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Old 02-14-2005, 10:11 PM   #1
creeper OP
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ZipTy FCR idle mixture screw in a BST

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.



"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".



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



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.

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creeper screwed with this post 04-20-2005 at 08:54 AM
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Old 02-15-2005, 04:44 AM   #2
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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...
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Old 02-15-2005, 06:28 AM   #3
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Quote:
Originally Posted by cugino pegaso
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...
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:



- anyone not switching wanna buy it? I am considering selling it and buying this new fangled part...
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meat popsicle screwed with this post 02-15-2005 at 09:43 AM Reason: pic link
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Old 02-15-2005, 08:59 AM   #4
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Originally Posted by meat popsicle
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:



- anyone not switching wanna buy it? I am considering selling it and buying this new fangled part...
It's a little on the cold side right now...

I had one of them white boxes with a red X in it once... never could sell it.
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Old 02-15-2005, 09:07 AM   #5
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Quote:
Originally Posted by creeper
It's a little on the cold side right now...
Get your sissy "weißes Arsch" out there and tune that thang....

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

:pui
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Old 02-15-2005, 09:19 AM   #6
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Cult? There's a cult?
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Old 02-15-2005, 09:45 AM   #7
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Originally Posted by creeper
It's a little on the cold side right now...

I had one of them white boxes with a red X in it once... never could sell it.
not in your heated garage...

fixed pic link, dang sudco
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Old 02-15-2005, 09:45 AM   #8
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Cult? There's a cult?

Cult


Hostages



You decide
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Old 02-15-2005, 10:16 AM   #9
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Quote:
Originally Posted by meat popsicle
not in your heated garage...

fixed pic link, dang sudco
"Dang" 'em...
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Old 02-15-2005, 10:20 AM   #10
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"Dang" 'em...
didn't you get the memo?

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Old 02-15-2005, 10:24 AM   #11
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didn't you get the memo?

You mean the one I sent out? About our self-appointed "hall monitor"?
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Old 02-15-2005, 10:59 AM   #12
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Quote:
Originally Posted by creeper
Based on a thread started by accadacca here... I ordered a ZipTy Racing idle mixture screw. Went in no problems. It'll be a few days before I can test and tune.

Creep
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?
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Old 02-15-2005, 11:14 AM   #13
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And that's why I'll start at 2 turns... I'm at near sea level.

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.

Tell your Pa thanks again for being the high altitude "beta tester" on this... I guess I'm gona' be the low altitude guy.
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Old 02-15-2005, 11:15 AM   #14
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Originally Posted by creeper
You mean the one I sent out? About our self-appointed "hall monitor"?
oh, right.

(um, is that me? )
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Old 02-15-2005, 11:34 AM   #15
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Fixed

Quote:
Originally Posted by creeper

Tell your Pa thanks again for being the high altitude "beta tester" on this... I guess I'm gona' be the bad attitude guy.
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