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<DIV dir=ltr align=left><SPAN class=946171820-02022009><FONT size=2>I would
suggest replacing the piston ring and perhaps even the
bearings.</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of
</B>adriancwong@earthlink.net<BR><B>Sent:</B> Monday, February 02, 2009 12:09
PM<BR><B>To:</B> paul.horan@sbcglobal.net; General pattern
discussion<BR><B>Subject:</B> Re: [NSRCA-discussion] YS 140 FZ: loads up and
dies 2500 - 4500 rpm<BR></FONT><BR></DIV>
<DIV></DIV>What fuel are you using? Check the exhaust valve for carbon deposit
and header opening for clogging. <BR><BR>The surging could be uneven contact
point on the valve cover. Wet sand it lightly with 400 sand paper on smooth
surface until surface shines.<BR><BR>Adrian<BR><BR><BR>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(0,0,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 0px">-----Original
Message----- <BR>From: Paul Horan <PAUL.HORAN@SBCGLOBAL.NET><BR>Sent: Feb 2,
2009 11:18 AM <BR>To: General pattern discussion
<NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>Subject: [NSRCA-discussion] YS 140 FZ:
loads up and dies 2500 - 4500 rpm <BR><BR>
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<DIV> The problem is a YS 140 FZ that runs fine at
idle and 40 to 100% throttle but loads up around 2500 - 4500 rpm.
This is especially nasty since that is the rpm range for a smooth
takeoff, once it goes to full throttle the engine does not develop
full power (about 40% power) and dies. Plenty of smoke trail
so it is not going lean. </DIV>
<DIV> Another symptom is on the ground running 2500 -
4500 rpm the rpm is not steady. </DIV>
<DIV>Help,</DIV>
<DIV>Paul</DIV>
<DIV>NSRCA 3606
</DIV></TD></TR></TBODY></TABLE></NSRCA-DISCUSSION@LISTS.NSRCA.ORG></PAUL.HORAN@SBCGLOBAL.NET></BLOCKQUOTE></BODY></HTML>