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<p class=MsoNormal><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'>Bob, I am
getting back into this discussion late. I went to the bearing store and when I
got home it was miller time.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><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'>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><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'>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><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'>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><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'>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><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'>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><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'>Jim Hiller</span></font></span><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
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