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<DIV>I agree with Don. Looks like there is an air leak. I will do the easy stuff first like replace <STRONG><EM>all</EM> </STRONG>the fuel lines. Small hole or cut in the fuel line could be a problem. </DIV>
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<DIV class=signature id=signature>--<BR>Vicente "Vince" Bortone</DIV>
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<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Don Ramsey" <don.ramsey@suddenlink.net> <BR>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; mso-bidi-font-family: 'Times New Roman'">It’s possible that the high speed needle has vibrated it’s seat open.<SPAN style="mso-spacerun: yes"> </SPAN>The 120s would do this because of weight of the needle valve.<SPAN style="mso-spacerun: yes"> </SPAN>Once the brass seat is opened, you have to replace the assembly.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; mso-bidi-font-family: 'Times New Roman'"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'; mso-fareast-font-family: 'Times New Roman'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'; mso-fareast-font-family: 'Times New Roman'"> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>ron@inweldcorp.com<BR><B>Sent:</B> Tuesday, August 26, 2008 10:38 AM<BR><B>To:</B> NSRCA<BR><B>Subject:</B> [NSRCA-discussion] YS FZ63S Trouble<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">I have a YS FZ63S on my Oxalys 50. The engine probably has about one hundred 12 minute flights on it.</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">The first trouble I noticed was that I had to trim the idle up to keep it running but the engine ran strong at full throttle.</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">After another 10 or 12 flights the engine would not develop full power. Also, the high speed needle valve is more sensitive where before it was difficult to tell exactly where the highest rpm was. Also the idle has to be trimmed way up as the engine warms up and it quits when trying to transition to high speed.</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">I have installed a new glow plug, adjusted the valves, adjusted the high and low speed mixture with no improvement. I see no air restriction to the carburetor. The fuel filter looks clean. What should I try next?</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><o:p></o:p></P>
<P class=MsoAutoSig>Ron Needham<o:p></o:p></P>
<P class=MsoAutoSig> <o:p></o:p></P></DIV></BLOCKQUOTE></body></html>