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<DIV><FONT face=Arial size=2>Hi Terry,</FONT></DIV>
<DIV><FONT face=Arial size=2>Seems like I was setting the slow speed wrong. I
was considering that turning the slow speed needle in would make the engine
leaner, and just find out that it is just the opposite. As you recommended, I'll
try from the start and change the nitro content.</FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks for the big help,</FONT></DIV>
<DIV><FONT face=Arial size=2>Fausto</FONT></DIV></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tbrox@cox.net href="mailto:tbrox@cox.net">Terry Brox</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> Saturday, April 05, 2003 3:30
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: YS 91 AC Adjustment
Problems.</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>I have had better experience running at least 25% nitro, and
prop the engine to run around 9000 rpm. Also remember, to lean the low spead
needle, you turn the screw out. It is an airbleed adjustment. Good luck,
Terry</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=hmetzger@alternex.com.br
href="mailto:hmetzger@alternex.com.br">Hugo Henriques</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> Friday, April 04, 2003 10:47
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> YS 91 AC Adjustment
Problems.</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2>I've just installed a brand new YS 91AC in a
Midwest Little Cap and started facing some problems. The engine was properly
broke in and really performed well in the test stand. As it was installed in
the model for flight (the fuel tank was tested before and after this
experience) I noticed that the mid range was "very rich" as the engine would
take a lot of time to reach full speed. I turned in the low speed needle
valve but didn't feel any performance increase, so I decided to turn in the
pump screw in. I turned the pump screw in almost two turns, as the engine
showed an imediate response from low speed to high speed. Anyway, the low
speed still needed some fine tuning but again I didn't feel any difference
turning the low speed neddle valve in or out, unless it was fully closed.
Afterwards, I decided the engine was running well for a test flight. I set
the high speed needle valve to a slight rich setting and took off. The
engine acelerated weel on the take off, but after a few turns on the sky and
a cuban eigth with reduced throtle on the dives the engine wouldn't
accelerate imediately and sounded lean. In these ocasions I backed the
throtle and acelerated again with no problems, but now the engine took more
time to reach full speed and sounded richer than the set up made on the
ground. My experience with YS engines refers to a 120 AC that ran
beautifully rigth out of the box, with adjustments made only on the high
speed needle valve as these engine doesn't have a low speed needle valve.
I'm using an OS F glow plug and Wildcat fuel with 10% nitro/ 18% oil. If
anyone can help me with commentes, specially for the slow speed neddle valve
that doesn't seems to affect the way the engine works, or even a
personal setting for the engine I'll be more than glad. I almost forgot
to mention that I recently installed the same engine in a GP U Can Do 3D
with another fuel tank, fuel lines and YS Check Valve. The problem
persists.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks in advance,</FONT></DIV>
<DIV><FONT face=Arial size=2>Fausto -
Brazil</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>