<DIV>Something is going on there. I have the same exact setup and no problems at all. Make sure your tank is air-tight. you can do this with an automotive vacuum gauge. Empty the tank, plug all the lines (except one of them) and apply vacuum. It should hold for at least 10 minutes.</DIV> <DIV> </DIV> <DIV>John Pavlick<BR><BR><B><I>Bob Richards <bob@toprudder.com></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <TABLE cellSpacing=0 cellPadding=0 border=0> <TBODY> <TR> <TD vAlign=top> <DIV>Jason,</DIV> <DIV> </DIV> <DIV>The reason I ask, I have the 120AX in a Venus II and with the stock muffler I have a fuel draw problem. The tank is all the way against the back of the firewall. If I adjust the mixture for max rpm with the nose pointed up, it is blubbering rich in level flight. I was going to experiment with adding more restriction at the exhaust outlet, but just stuck it on
the rack and have not touched it.</DIV> <DIV> </DIV> <DIV>A couple of guys have that engine with the Jerry Smith style mousse can mufflers, and they work great. They have much more back pressure but turn up more rpms. The extra muffler pressure helps with the fuel draw.</DIV> <DIV> </DIV> <DIV>Bob R<BR><BR>--- On <B>Thu, 6/26/08, JShulman <I><jshulman@cfl.rr.com></I></B> wrote:<BR></DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR> <DIV><SPAN class=200081800-27062008><FONT face=Arial color=#0000ff>Stock muffler</FONT></SPAN></DIV> <DIV> </DIV> <BLOCKQUOTE> <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Bob Richards<BR><B>Sent:</B> Thursday, June 26, 2008 3:56 PM<BR><B>To:</B> General pattern
discussion<BR><B>Subject:</B> Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport<BR><BR></FONT></DIV> <TABLE cellSpacing=0 cellPadding=0 border=0> <TBODY> <TR> <TD vAlign=top> <DIV>What are you guys using for muffler/pipe on the 120AX?</DIV> <DIV> </DIV> <DIV> </DIV></TD></TR></TBODY></TABLE></BLOCKQUOTE></BLOCKQUOTE><PRE> </PRE></TD></TR></TBODY></TABLE>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE><BR>