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<DIV>Thanks to all that responded. Engine has had a Boca stainless steel
sealed rear bearing since new and right now I cannot feel any play in it. I'm
leaning towards some kind of leak in the carb area, although the nose of the
plane is dry. Head bolts are tight. I'll be taking it apart today
and hopefully I'll find the problem. </DIV>
<DIV>Ed M. </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=khoard@gmail.com href="mailto:khoard@gmail.com">Keith Hoard</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, June 26, 2006 9:27 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] OS 140RX
rough and inconsistent idle</DIV>
<DIV><BR></DIV>I'll second that. . . . check your bearings and put in a set of
stainless. . .<BR><BR>
<DIV><SPAN class=gmail_quote>On 6/26/06, <B class=gmail_sendername><A
href="mailto:mwaustin54@cox.net">mwaustin54@cox.net</A></B> <<A
href="mailto:mwaustin54@cox.net">mwaustin54@cox.net</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">You
might check your bearings. My OS 140 did this after 50 or so flights. New
bearings solved the problem. I also run the Mentor head and like the
transition. <BR><BR>Mike A.<BR>---- Ed Miller <<A
href="mailto:edbon85@charter.net">edbon85@charter.net</A>> wrote:<BR>>
Have an OS 140RX that has developed a rough and inconsistent idle.
Engine<BR>> runs perfectly except for idle. It has a Mintor head with
either an OS F or <BR>> K&B 1L in center plug and an OS A5 in the
angled plug position, a Perf Spec<BR>> AAC piston/liner assembly and a
Boca sealed SS rear bearing. I have the head<BR>> mounted with angled
plug towards the front or carb side of engine. Fuel is <BR>> S&W 20
nitro, 16 synthetic and 2 castor. Engine has 7 gallons of fuel run<BR>>
through it. Prop is an APC 15.75 x 11 3 blade by Dave
Lockhart. The lowest<BR>> I can get the idle before it quits
is 1900 ~ 2000 rpm and it is rough, <BR>> sounds like it is firing every
other revolution. Idle mixture screw is<BR>> working, I can richen idle
to point where engine will barely transition from<BR>> being rich and I
can lean mixture so the transition is fine but engine slows <BR>> at idle
like it is too rich. While it is slowing with either the idle<BR>>
mixture screw lean or rich, engine is rough, again like it often fires
every<BR>> other revolution at times. I used to be able to reliably idle
this engine at <BR>> 1300 rpm. I have a second OS 140RX set up exactly
the same except it doesn't<BR>> have the AAC piston/liner and it
runs/idles perfectly. Tried cleaning the<BR>> carb/spray bar with no
change. I once had a Super Tiger that exhibited <BR>> similar
characteristics due to a worn out con rod. Is it possible the
con<BR>> rod on this OS could cause this issue ?? Any suggestions will be
greatly<BR>> appreciated.<BR>> Ed M.<BR>>
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clear=all><BR>-- <BR><BR>Keith Hoard<BR>Collierville, TN<BR><A
href="mailto:khoard@gmail.com">khoard@gmail.com</A><BR><BR>
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