As I read your post you are dealing with parts availability (pistons and needles) which are conflicting (more adjustable needles to choose from but expensive pistons to put them in vs less expensive fixed needle pistons with a poor selection of needles). Does that sound right?
How about these options then. Buy the adjustable needles and see if you cannot remove them from the "adjustable" portion. I doubt Burlen (or Joe C.) makes these as one piece threaded & tapered parts. It would be more economical to make the threaded adjustable parts in bulk and press the needle into them. By removing the adjustable portion you could end up with needles that will fit the fixed needle pistons.
Also being naive, what about buying the basic fixed needles and turning them in a drill (or lathe preferably) to get the taper profile you want? As long as you need to remove material to get the desired profile you should be OK. This is a procedure some people undertake with SU needles to get what they want.
Again, probably all naive so don't shoot the messenger.
Doug L.
--Previous Message--
: These are the factors I'm working with
: though:
:
: 1. Just for simplicity sake, I'd like
: to get rid of the emissions plumbing,
: so I'd need needles that aren't
: expecting the vacuum retard at idle,
: nor the bypass valve leaness during off
: throttle deceleration. That leaves me
: with the CD150 fixed needles, or the
: non-emission controlled overseas
: needles.
:
: 2. I "can" activate all the
: emission systems and then use later, US
: spec needles. But:
:
: 3. The adjustable pistons (which
: aren't needed) cost three times as much
: as the fixed needle pistons. So:
:
: 4. Buying another fixed needle piston
: is a viable option. However:
:
: 5. As you all know, the availability
: of fixed needles is the most limited of
: all.
:
: Ahhhh,.... The joys of ham-fisting a
: custom set-up. It "must be"
: what I live for.
:
:
:
: --Previous Message--
: "Anyway, in order to accommodate
: the
: later needles I'm going to have to dill
: out the holes in the bottom of the air
: valves (pistons) and "hope" I
: don't spin the steel inserts in the
: aluminum while doing so!"
:
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