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<DIV>
<DIV>Buddy,</DIV>
<DIV> </DIV>
<DIV>I've been running a 140L with a 1/2 Teflon coupler and Hatori pipe and
getting about 8,400rpm with a 16x11 using Wildcat 15% Nitro / 18% all Synthetic
oil. I've been told it will run better with more Nitro. I haven't ried it yet as
I didn't want to change anything during the season.</DIV>
<DIV> </DIV>
<DIV>I'm wondering if the pop you heard was a backfire and split the coupler. My
coupler is about 9 inches long and have about 100 flights on it this season with
no problem.</DIV>
<DIV> </DIV>
<DIV>None the less the Focus ran strong all year with this set up and fuel,
with good vertical performance.</DIV>
<DIV> </DIV>
<DIV>Engines are not my strength, so I'm not much help with what could be wrong.
I think the problem is in the 140L though.</DIV>
<DIV> </DIV>
<DIV>See ya,</DIV>
<DIV> </DIV>
<DIV>Larry</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial"><B>From:</B> <A
href="mailto:BUDDYonRC@aol.com">BUDDYonRC@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, September 27, 2003 8:49
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Header,teflon, Muffler?</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial
color=#8000ff size=2 FAMILY="SANSSERIF">I have been having occasional problems
with RPM and what seems like overheating on my YS-140-L. I have come to
believe the problem is restriction in the muffler, but the muffler seems to be
open and OK<BR>The problem seems to have something to do with the prop size
also. <BR>Running a 15-1/2 x 13N rpm at about 8200 everything is fine,
switched to a 16 x11 and running @ 8400 rpm and later in the flight the power
back's off, I think it is heating up.<BR>Yesterday I switched to a 16 x10 prop
turning 8800 rpm and half way through the flight I heard a loud pop, After
that the engine would not turn up. I landed and found that the Teflon coupler
had split long ways about three inches long and had curled inward restricting
the flow. This has happened on two different mufflers a Hatori and a Johnson
that is shaped like the Hatori Has anyone run into this problem before? and
what is the solution? Is there another Aluminum muffler that will work?
I have another setup using a CF muffler and have not had problems with it even
at 9000rpm with a 16 x11 prop but choke when I think of spending $175.00 for
another muffler.<BR>Buddy
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