<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>That's my vote, ring and probably bearings, if the engine has any serious time on it. <br><br>Not only the ring but if the slot for the ring is also worn (the ring has a sloppy fit in the piston slot and can move up and down visibly at all), you may need a new piston as well.<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br>Ed<br><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Derek Koopowitz <derekkoopowitz@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> General pattern discussion <nsrca-discussion@lists.nsrca.org><br><b><span style="font-weight: bold;">Sent:</span></b> Monday,
February 2, 2009 2:19:14 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm<br></font><br>
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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: 2px solid rgb(0, 0, 255); padding-left: 5px; margin-left: 0px;">-----Original
Message----- <br>From: Paul Horan <br>Sent: Feb 2,
2009 11:18 AM <br>To: General pattern discussion
<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
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