<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1170" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Don,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Yes the "V" on the barrel is the production
version. There were only a few of the non-V barrels out there on the motors that
a few of us had before the actual release. The initial thing on the original
prototype is they were tough to lean out on the bottom end and get a solid idle
like previous motors...It would be a little rich and never die in the air....but
on the ground sometimes it would just load up a little after a fairly long
90sec+ idle.....To my knowledge all of the production motors have had this notch
to lean the bottom end slightly....Another thing to my knowledge there have not
been the changes the in throttle barrels like on previous versions of YS
motors....I know many people felt it was the throttle barrel of the day....as
many were quite different. I have a new DZ from the latest shipment and I have a
production Carb on my original test motor (may of 2000)....This carb was changed
out when the production motors were released. That first run production
barrel and the new latest run barrel are the same...I have looked closely at the
scroll and can't find any difference.... </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>My current setup is running about 1-3/8 to 1.25
open on the top end and just inside flush maybe about 3/4 turn to a turn.....The
idle is very good and the transition is great...If you get too lean of idle what
will happen is the motor will rev right off idle as you throttle up then richen
up and transition fine....I use this rev up as a key its too lean and richen
past this point slightly....</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keep up the practice! Its going to be a fun
event!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>When are you going down?....I'm going to be at my
wife's parents on about June 1-2 and they live about 90mins north of the
Woodruff contest site. My guess is we will go down and fly on Tuesday and then
do the airplane checkin on Weds morning.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Troy</FONT></DIV></FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=dszczur@maranatha.net href="mailto:dszczur@maranatha.net">don
szczur</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, May 14, 2003 9:16
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 30 second setup for the YS
140DZ</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>Actually, like most things, they develop and refine over
time. I noticed when I changed my YS out (it ran great but after about
24 gallons, its way past when it should normally be serviced) with my backup
DZ, I noticed that the backup had a throttle barrell with a small notch,
or "v" cut in the front edge of the butterfly. It acts like an air
bleed when the throttle is shut. Any case, this version of the (carb)
runs significantly leaner on the low end. A characteristic of lean low end is
a hesitation when advancing the throttle from idle to full. I screwed
the pump in about a half turn IN past flush, from the housing point to bump up
the pressure and thus richen the idle so it does not hesitate much. No
difference in the air from the other DZ. So, the type of carb design may
impact the pump position. The same process used below to adjust
though.</FONT></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid"><FONT
face=Arial size=2></FONT> </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>