[Roadsters] ZTherapy carbs & needles--was su backwards chokes

[Pete Peters]

Have any of you talked to Steve at ZTherapy? He's a great guy, drives a mean
roadster, and doesn't want unhappy customers.

Good thread on needles (haha...pun intended):

<http://www.311s.org/phpBB3/viewtopic.php? f=3&t=4927>

Pete

-----Original Message-----
From: datsun-roadsters-bounces at autox.team.net [mailto:
datsun-roadsters-bounces at autox.team.net] On Behalf Of Tim
Sent: Wednesday, November 03, 2010 11:22 AM
To: datsun-roadsters: autox. team. net
Subject: Re: [Roadsters] ZTherapy carbs & needles--was su backwards chokes

Paul, 

Do you know what needles you are using (and where you got them) that you put
in those ZTherapy carbs? I may be having a similar issue with my newish
ZTherapy carbs... I can't seem to get the mixture right. It goes from too
rich to lean with very very little knob adjustment.

Others have suggested to me that the needles that ZTherapy use in their
carbs are not exactly/perfectly correct for the Roadster. 

Anyone else have or wonder at this issue with new ZTherapy carbs?

Tim
Dairyland Datsuns

---- Paul Bauman <plhbauman at earthlink.net wrote: 

=============
I know that needle profile seems to have a lot to do with when you are as
much as where you are.

I've been told that cars running in high altitudes run better with a
different needle than stock due to changes in air density. This also seems
to be the case with changes in fuel composition or 
octane levels over the years.

When I bought my roadster in the 70s, it ran super on stock needles, even
ingesting 89 octane regular. Then I got married and put the toys away. About
20 years later I decided to rebuild the car 
and found that I could not get a decent idle and/or smooth revving above
4000. After changing to a non-stock needle profile, things went back to
running nice and smooth.

Then the front carb would not stop leaking gas, so I got a rebuilt set from
Z Therapy. Until I swapped the needles to the non-stock profile I used in my
old setup, I had similar idle/revving issues. 
She runs better than super now. Go figure.

By the way, I live in California. What's a 'choke'?

Paul Bauman
Westminster, CA
67 1600