<div>Aha! Interesting. I wasn't aware that there were two different carb's used on this engine. What numbers are on each carb? My engine is most likely later production and it runs fine in the Venus 2 with the tank on the firewall with reasonable prop sizes.</div>  <div>&nbsp;</div>  <div>John Pavlick<BR><BR><B><I>J N Hiller &lt;jnhiller@earthlink.net&gt;</I></B> wrote:</div>  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">  <META content=Word.Document name=ProgId>  <META content="Microsoft Word 9" name=Generator>  <META content="Microsoft Word 9" name=Originator><LINK href="cid:filelist.xml@01C8D7CF.0C73D8E0" rel=File-List>  <STYLE>  <!--  #yiv459724840     _filtered #yiv459724840 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}  _filtered #yiv459724840 {margin:1.0in 1.25in 1.0in 1.25in;}   /* Style Definitions */  p.MsoNormal, li.MsoNormal, div.MsoNormal   {mso-style-parent:"";   margin:0in;   margin-bottom:.0001pt;
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 <DIV class=Section1>  <div class=MsoNormal><SPAN class=EmailStyle88><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Bob, I am getting back into this discussion late. I went to the bearing store and when I got home it was miller time.
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style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>John they
were labeled the same, which is what prompted me to inquire to &quot;Engine
Support&quot; as whether there was a change and which one was
&quot;correct&quot;. I still have the e-mail chain with the standard reply to
send it in and no answer as to which one was correct. I made mine work and
dropped the issue. I guess I should have inquired directly to OS but not being their
customer my inquiry would likely be disregarded.<o:p></o:p></span></font></span></p>

<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Jim<o:p></o:p></span></font></span></p>

<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>John Pavlick<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, June 27, 2008 6:33
AM<br>
<b><span style='font-weight:bold'>To:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion] OS
91FX or 120 AX for Focus sport</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]>&nbsp;<![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>I have two AX'es purchased at different
times and their carburetors are different (see photo). I am currently using the
OS muffler and the first motor carb pictured on the left has a serious fuel
draw problem and the other one works fine with the tank against the firewall. I
was already into a 1.20 size airplane when the OS 1.20 AX appeared on the
market and I got one right away, which was likely early production (left carb).
The idle needle didn't withdraw fully from the fuel delivery tube at full throttle
and the barrel has an air bleed hole through the bottom side, which opens to
the intake around half throttle. I shortened the needle, which helped some but
ultimately I added an exhaust restrictor (.350 ID) to increase backpressure
before I got an acceptable mixture setting and transition. <o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>I inquired about the difference but
understandably got no reply. The other carb from the second motor works much
better. <o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>I suspect running a 16-10 is a little too
much load and I need to advance the throttle before going vertical to get the
RPM's up to produce sufficient back pressure / heat or it will go lean. The OS
muffler is likely sized to operate with more exhaust volume using a smaller
prop at higher RPM's.<o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>I plan to try a double quiet Mac pipe,
probably with a pump in the next airplane. <o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>Sorry about the photo size. I had to make
it quite small to fit the file size restriction.<o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><span class=emailstyle88><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>Jim Hiller</span></font></span><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>_______________________________________________<br>
NSRCA-discussion mailing list<br>
NSRCA-discussion@lists.nsrca.org<br>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]>&nbsp;<![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>

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