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From: JohnA in LA on 10 Sep 2009 13:17
On Sep 9, 12:28 pm, 1949 Whizzer <macmi...(a)gmail.com> wrote:
> On Sep 9, 11:06 am, "Dave" <dspear9...(a)yahoo.com> wrote:
>
> > Is the needle height adjustable?
>
> Needle height really isn't all that important, but amateur tuners will
> often stack a few 0.5mm washers under the head of a non-adjustable
> needle.
>
> They think they are really smart when they do this, but what they are
> doing is just causing the needle to allow gasoline past the needle jet
> slightly sooner, they aren't affecting the peak power of the engine,
> they are affecting the midrange, and it's possible that the engine
> isn't producing enough vacuum at lower RPM to lift the slide enough to
> take advantage of extra needle height anyway.
>
> www.factorypro.comhas some *really* good tips about CV carburetor
> tuning and troubleshooting that the manufacturers of competing jet
> kits don't want you to know.
>
> For instance, there are pictures of needles that are badly worn and
> needle jets that
> are *subtly* worn in an egg shape so that gasoline can get past them
> at small throttle settings, like less than 1/4 of the slide lift

FactoryPro is a great resource.

Just replaced the emulsion tubes that the needles slide into on my
Y2K Pegaso. It would idle and it would run at speed.
But, off the line it would stumble and up to 3k rpm it was rough.
That is all gone now with the new, non-oval tubes.
And, fuel economy is up about 80%.

JohnA in LA, CA USA
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