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<DIV dir=ltr align=left><SPAN class=841271815-13072008><FONT face=Arial
color=#0000ff size=2>I have seen issues running ys engines and not using the
right fuel. its the viscosity of oil in the ys blends and the heli fuels
that ys needs ? that could explain why the motor only runs for a few
minutes till it heats up and the fuel could be affecting the regulator.
maybe someone else can give a more eloquent description on why .. sounds like a
fuel issue to me based on my somewhat limited experience...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=841271815-13072008></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=841271815-13072008><FONT face=Arial
color=#0000ff size=2>gary</FONT> </SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>Stuart
Chale<BR><B>Sent:</B> Sunday, July 13, 2008 10:15 AM<BR><B>To:</B> General
pattern discussion<BR><B>Subject:</B> Re: [NSRCA-discussion] 120 AC
issues<BR></FONT><BR></DIV>
<DIV></DIV>Gaskets seem fine although I made sure everything was well tightened
this time around. Unfortunately I do not have any replacement gaskets at
this point to just replace them. The box did slide into the case fairly
easily. I guess the 2 red O rings could be worn.<BR><BR>As far as Gary's
suggestion on fuel. I think I have only been running a standard cool power
15% on it. Would that account for 5 minutes of normal running and then
problems?<BR><BR>I wonder if I can use the extra Trex 600 motor and 7 cell packs
I have for the heli :) That would solve these
problems.<BR><BR>Stu<BR><BR>Jerry Stebbins wrote:
<BLOCKQUOTE cite=mid:001701c8e4f9$c9acbdf0$4f01a8c0@jerryscomputer
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<DIV><FONT face=Arial size=2>Stu, when the engine is running, and well warmed
up, run it up and get it at a higher RPM, and watch for any sign
of bubbles in the fuel lines.That is an indication of the extra heat Ron
mentioned from a bad bearing/tight bearing/shaft. Some AC's really suffered
from that problem. Also had a slightly bent shaft cause heat in the front end.
Might also check valve cover gasket/seal ( sand the cover flat) since that
could give similar symptoms after everything gets warmed up. I assume you have
already checked the box cover and gaskets.</FONT></DIV>
<DIV><FONT face=Arial size=2>Jerry</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal">-----
Original Message ----- </DIV>
<DIV
style="BACKGROUND: rgb(228,228,228) 0% 50%; FONT: 10pt arial; font-size-adjust: none; font-stretch: normal; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial"><B>From:</B>
<A title=schale@optonline.net href="mailto:schale@optonline.net"
moz-do-not-send="true">Stuart Chale</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>To:</B>
<A title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org"
moz-do-not-send="true">General pattern discussion</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Sent:</B>
Sunday, July 13, 2008 9:53 AM</DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Subject:</B>
Re: [NSRCA-discussion] 120 AC issues</DIV>
<DIV><BR></DIV>Sure I just get upstairs after pulling the motor apart again
and swapping out the cylinder liner for one from another motor. Looked
almost new no burn marks but my son is getting frustrated with little flying
time each time at the field so I changed it just in case. Put both
motors back together reinstalled the motor in the plane. Found a new
muffler in the box, put that on. Only to find that I should have
changed the front bearing as well :)<BR>Can you be a little quicker next
time Ron? :)<BR>If this doesn't work next time the bearing and
anything else suggested. Bearings feel fine though. Engine was
really almost new. Not even much carbon or varnish at the
valves.<BR>Thanks,<BR>Stu<BR><BR><A class=moz-txt-link-abbreviated
href="mailto:ronclark51@comcast.net"
moz-do-not-send="true">ronclark51@comcast.net</A> wrote:
<BLOCKQUOTE
cite=mid:071320081346.24982.487A073900034467000061962205889116CECA059D0E040C02019D@comcast.net
type="cite">
<DIV>Stuart,</DIV>
<DIV>I've had the same problem before. It was the front bearing. The
bearing heats up the front of the motor, then the regulator, vaporizing
the fuel. Better known as vapor lock.</DIV>
<DIV> </DIV>
<DIV>Ron.....................</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">--------------
Original message -------------- <BR>From: Stuart Chale <A
class=moz-txt-link-rfc2396E href="mailto:schale@optonline.net"
moz-do-not-send="true"><schale@optonline.net></A> <BR>I wouldn't
have thought about the pipe. I should have
another.<BR>Thanks,<BR>Stuart<BR><BR><A class=moz-txt-link-abbreviated
href="mailto:RUDDERCABL@aol.com"
moz-do-not-send="true">RUDDERCABL@aol.com</A> wrote:
<BLOCKQUOTE cite=mid:cf2.382570e3.35ab5288@aol.com type="cite">
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<DIV>
<DIV>In a message dated 7/12/2008 11:33:24 PM Eastern Daylight Time,
<A class=moz-txt-link-abbreviated href="mailto:schale@optonline.net"
moz-do-not-send="true">schale@optonline.net</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000
size=2>I'll have to pull it a part again and see if I see anything
with the sleeve.<BR>Anyone else have any
thoughts?<BR>Thanks,<BR>Stu<BR></FONT></BLOCKQUOTE></DIV>
<DIV>Sure do.</DIV>
<DIV> </DIV>
<DIV>Try a different pipe. I know a flyer who had this same problem
some years ago, not with an AC though. He tried everything and the
problem kept hounding him. Turned out that the pipe was plugging up
when it heated up and restricting the exhuast flow. </DIV>
<DIV> </DIV>
<DIV>Robert</DIV></FONT><BR><BR><BR>
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<DIV class=headerdisplayname style="DISPLAY: inline">Subject:
</DIV>Re: [NSRCA-discussion] 120 AC issues</TD></TR>
<TR>
<TD>
<DIV class=headerdisplayname style="DISPLAY: inline">From:
</DIV>Stuart Chale <A class=moz-txt-link-rfc2396E
href="mailto:schale@optonline.net"
moz-do-not-send="true"><schale@optonline.net></A></TD></TR>
<TR>
<TD>
<DIV class=headerdisplayname style="DISPLAY: inline">Date:
</DIV>Sun, 13 Jul 2008 12:51:04 +0000</TD></TR>
<TR>
<TD>
<DIV class=headerdisplayname style="DISPLAY: inline">To:
</DIV>General pattern discussion <A class=moz-txt-link-rfc2396E
href="mailto:nsrca-discussion@lists.nsrca.org"
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