Charles:
AN is a standard fixed needle for a 1275. The shoulder should be flush w/
the base of the piston. I am not sure I understand you question re:
smoothness. The AN needle is .090 at the top of the shoulder and tapers
down to the distal end. The taper is measured at 1/8 inch intervals to
determine the needle's profile. Fixed needles don't wear out. (The later
spring-loaded ones did. The fixed needle must be perfectly centered in the
jet or it will drag and the piston will not rise and fall smoothly. To
check this, there should be a distinct "click" when you raise the piston to
the top and again, when you let it fall. If there is no click, the needle
is bent, or the jet is not centered and you need to recenter w/ a PSW jet
centering tool kit.
Good luck!
Richard
----- Original Message -----
From: Charles D. Sorkin <cdsorkin@ix.netcom.com>
To: MG List <mgs@autox.team.net>; Spridgets list <spridgets@autox.team.net>
Sent: Monday, March 06, 2000 9:05 PM
Subject: SU disassembly
> Dear List:
>
> A couple of questions about HS2 carbs:
>
> Should the "AN" needle be completely smooth along its entire length, or
> should the top 1/2" of it be larger where it mounts to the piston?
> Where does the needle usually wear?
> When reinstalling the needle, should it go all of the way into the piston,
> or should the ridge on the upper part be flush with the bottom of the
> piston?
> Is "AN" the normal mixture needle?
>
> And when reassembling, how do I split the screws that hold the throttle
> plate in place?
> Which way does the bevel go on the throttle plate?
>
> Regards,
>
> Charles
> '74 Midget
> '68 Sprite
> cdsorkin@ix.netcom.com
> Bloomfield, NJ
>
> P. S. How do I get dashpot oil off of my computer keyboard?
>
>
>
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