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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Make sure you pinch the line when it is running full throttle.
If the rpms jump, your needle is too rich. If you pinch it and they stay the
same, you can back off two clicks. If you pinch the line and it cuts or drops
in rpms, you are too lean.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jim<o:p></o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Michael
Cohen<br>
<b>Sent:</b> Friday, August 21, 2009 4:46 PM<br>
<b>To:</b> nsrca-discussion@lists.nsrca.org<br>
<b>Subject:</b> Re: [NSRCA-discussion] YS engine follow up<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>I
will check that as well at the field on Sunday, but it was idling really
well for about 20 to 30 seconds.<br>
<o:p></o:p></span></p>
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style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>
<hr size=2 width="100%" align=center id=stopSpelling>
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<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Date: Fri, 21 Aug 2009 14:58:08 -0400<br>
From: jim.woodward@baesystems.com<br>
To: nsrca-discussion@lists.nsrca.org<br>
Subject: Re: [NSRCA-discussion] YS engine follow up<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Mike – did you “pinch” the fuel line to see what the rpms
would do?</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jim</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Michael
Cohen<br>
<b>Sent:</b> Friday, August 21, 2009 2:52 PM<br>
<b>To:</b> nsrca-discussion@lists.nsrca.org<br>
<b>Subject:</b> [NSRCA-discussion] YS engine follow up</span><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Well, I ran the YS engine I had trouble
with the other day and am reporting back with my findings. First, the
inspection and changes. I looked for cracks or splits in the o-rings and
saw none. I went back to flush on the pump (it was about 3/4 of a
turn out). After starting the engine and running on a high mid
throttle and back down to idle, I tweaked the pump slightly to
keep a good 2000 to 2200 idle. I left the high speed set where it was,
but after running at full power, I went to get the tach and the engine
would die abruptly. I decided to check the valve clearance and
reset it to .0015 to .0020 inches. Since the valve cover was off, I
did a quick wet sand on the valve cover. Since I was out 2.25 turn on the
main needle (much further than any other DZ I have), I decided to simply turn
it in to 1.75 turns and see what would happen. I know for a good
controlled experiment, one should not alter more than one thing at a time, but the
engine seemed to work just fine now. High end power was up to 7400
to 7500 RPM on an 18.1 X 10 prop from the 7200 (but rapidly sagging) setting
before. Richening the high setting slightly cause a slight drop in RPM,
so I left it at 1.75 out and double checked the idle and the transition
from idle to full power. Everything seems to work great, but I will try
it in the air on Sunday before feeling more comfortable.<br>
<br>
In summary, from the previous, issue free running of this engine in a Brio, I
made the following changes:<br>
<br>
1) Had a mid air and buried the engine nicely in a plowed field.<br>
2) Disassembled, inspected, cleaned, and reassembled the engine
(using klotz synthetic oil as a lube) and installed it into an Eclipse<br>
3) Used a 18.1 X 10 2 blade in place of the 15.5 X 12 4 blade<br>
4) Ran the engine on the ground to check its operation, all seemed normal<br>
5) Had one flight on the engine last weekend and on the second
flight, the dying at full power issue popped up. Admittedly, it was
a very humid day last weekend.<br>
6) Reset the pump to flush and checked the idle for a nice 2000-2200
run. The high power setting issue was still present.<br>
7) Reset valve clearance, sanded the valve cover, and reset the high
speed needle to 1.75 turns out. Problem solved!<br>
<br>
So, now for the educational questions:<br>
<br>
Could the high speed needle being so far out have cause the abrupt high speed
"flame out"?<br>
<br>
Does switching from a 2 blade from a 4 blade make a difference and why?<br>
<br>
Does the valve clearance being in the .003 range instead of the .000 to .002
(as recommended) make that much of a difference?<br>
<br>
Could an air leak cause this high speed flame out problem?<br>
<br>
I am interested to know so I can someday become the Troy Newman of the East
(maybe) for YS engines. I don't get a heck of a lot of flights per year,
so my statistical database is lacking. But that said, I did help two
people with their YS engine troubles at the Weak Signals contest so I must be
learning something! Thanks all for the help.<o:p></o:p></span></p>
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